Is it a good idea to practice on a digital piano?
Rubens I think most people who try both instruments would say the P-525 has a lighter action than the ES920. But what matters most IMO is that you choose the one whose action most resembles that of your acoustic.
Thank you. That sounds like a great idea to help the transition between the digital and the acoustic. The action of our acoustic is on the heavier side, although it’s getting lighter (psychologically perhaps) as the new hammers break in. I may drive to the bigger city an hour away from us to try the digital pianos at a dealership.
One thing that a decent digital keyboard has going for it is that there is some adjustment of touch available. Can't do that with an acoustic, you've got what you've got unless you wanna spend some serious coin.
I say that with a bit of caution because generally, it's not the actual downweight or inertia of the key that's adjustable, but what happens from a feedback perspective can be altered significantly. There is a very wide range of sensitivity that is available on my Roland keyboard all the way from a very heavy feel and having to pound the keys very hard for minimal auditory reaction to a very light feel where even a light key touch will give a much more dynamic auditory reaction. (I've probably not said that quite right but hopefully you'll get the point.)
Also keep in mind that the action of a digital piano cannot be changed. But the sound engine can easily be replaced by hooking it up to a computer. Therefore when choosing a model, it would be wise to select the one with the better action over the one with better sound.
Playing on digital pianos of the Clavinova-type (by which I mean with that kind of action and sound, be it a slab or a cabinet) is absolutely fine. The touch weight is good enough for all practice. Let's not forget that 100 years ago pianists used to practice on silent keyboards which did not feel like pianos but had weights to mimic the touch. I honestly think that for the last 30 years - maybe even a bit longer - digital pianos have been absolutely fine for practice when it comes to learning notes especially, and refining some movements of technique. Now, you're not going to get much in the way of refined sound on an older digital, but you'll get enough to give you the vague idea. With newer digitals you can do much more refined practice. OK, it's not a grand piano and there are still big important differences but it's fine. Just be careful with how much force you are using and how much pedal you are using.
We actually have a Clavinova, though it's an old clunker and definitely more of an entry level model (CLP-811). My memories of an actual acoustic are rusty, but so far I haven't missed anything just yet. It feels real enough, though of course my skill level is still confined to "a little less loud here and more pedal there" 
The only issue I have is the very loud clack clacking of the keys, but that is probably because it's been gathering dust in the basement for more than two decades before I finally decided it was time to use it for more than just an ornament 
I use my Yamaha P515 for repetitive type practicing, learning new notes, etc. as Joseph mentioned above. Then I refine on the acoustic. I still find the acoustic is way more responsive than digitals - and depending on many factors, including weather, temperature, etc., the tone does vary from day to day.
Bellyman One thing that a decent digital keyboard has going for it is that there is some adjustment of touch available. Can't do that with an acoustic, you've got what you've got unless you wanna spend some serious coin.
That is cool new information to me! I wonder if this function is only available in high end digitals. It sounds like a very useful feature for people (me) trying to adapt to playing on different pianos.
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Joseph-Fleetwood Let's not forget that 100 years ago pianists used to practice on silent keyboards which did not feel like pianos but had weights to mimic the touch. I honestly think that for the last 30 years - maybe even a bit longer - digital pianos have been absolutely fine for practice when it comes to learning notes especially, and refining some movements of technique.
We are indeed very “spoiled” when compared with pianists years ago. This reminds me of a practice method that my teacher told me, that is to imagine practicing when you don’t have a piano around, to think about the touch, feel, sound, and movements, etc. I found that pretty helpful. That would be silent practicing 
Sophia The only issue I have is the very loud clack clacking of the keys, but that is probably because it's been gathering dust in the basement for more than two decades before I finally decided it was time to use it for more than just an ornament
My university’s practice pianos (acoustic uprights) make the clacking noises too! Some keys produce louder noises than sound 
. I don’t know if it’s because of the worn felt.
cheeeeee Yeah, it depends on the piano and the keyboard. Some pianos have quite a lot of action / keyboard noise and so do some keyboards. But not all. Probably need to try them out and see for yourself. My older Roland keyboard and my cheap Casio keyboard are quite noisy (clickety clack) while my newer Roland keyboard is very smooth and quiet.
cheeeeee Music colleges all over the world are full of uprights that are never regulated. The RCS in Glasgow used to have (maybe still has...) a stock of probably over 100 Welmar upright pianos that would have been fairly decent but they were just never serviced. They ranged from being extremely loud and light to being fudged up with some kind of gunk (from unwashed student hands probably - more likely humidity) and honestly I think I'd have preferred a CLP760 (Yamaha, 1990) to that.
I hear this question all the time. First, understand there's no such thing as "feels like a piano" or "sounds like a piano". Every piano feels different and sounds different. Your piano at home isn't going to feel just like the piano in your teacher's home - even if its the same brand and model. I would ask is it a good idea to practice on an 80 year old "real" piano that is at the end of its life? Even a cheap digital would probably perform better.
A digital piano from a top brand like Roland or Yamaha has the performance level of a good grand piano. You can also buy on brand new for about $1200. A used $1200 "real" upright piano is going to probably be 40 years old and cannot have the performance level of a good grand.
I tell people you should think about pianos the way we do cameras.
Most of us don't use "real" cameras where you have to put in film and learn about f-stops and shutter speed, and then get the film developed.
Most of us use DIGITAL cameras because of all the things you can easily do to the picture.
Did you know there is actually a Roland digital piano at Carnegie Hall? Did you know that famous concert artists have even recorded albums using it?
If it's good enough for a concert artist - it's good enough for us "normal" people.
FULL DISCLOSURE: I've been selling pianos for 40 years and have experienced first-hand the changes in the industry.
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Based on the video by Josh Wright, depends on how far you want to go with your piano playing. You get a high-end hybrid DP you get a similar action as a real piano with 88 hammers but the sound can be subjective. Instead of reproducing sound from strings, it's coming from pre-recorded samples. The majority who are not going to become a professional performer wouldn't matter.
A few years ago I was invited to a Christmas gathering. A young lady who passed her ABRSM-8 exam played a Jazzy tune for us on a Yamaha upright. The piano used to be in a narrow bedroom in an apartment which gives too much echoes as you play. Now the piano is out in the living room where it should be. An upright in a small bedroom would be pushing it. Don't think the apartment unit is big enough to accommodate even a baby grand.
Unless someone is a professional who performs regularly, even those who passed music conservatory exams at a high level isn't at the level of the world's top performers.
There are practical reasons why people like myself would have a digital at home even after a decade of playing. First living in a building with neighbors around. Headphones is an option playing late at night. And there is the problem of getting rid of a piano when people at home quit playing. Because of the size & weight, it's not easy to get rid of a piano. People with kids at home try piano for a few months up to a year. The kids don't really like piano. A digital is easier to pass to a friend or neighbor. An acoustic tend to stay as part of the family. I know 1 family who had a Kohler & Campbell grand (an American brand no longer in business). All 3 kids at home tried piano up to a year but they all quit. The piano is in very good condition and sits at home as a piece of furniture... with the cover closed. The only time the cover is open is for dusting.
A lot of people said playing both a digital & acoustic whenever possible as a good compromise. People who live in an apartment needs to quiet the sound can consider buying an acoustic silent piano. You can practice normally with the hammers hitting the strings or lock the strings so that the hammers hit microprocessors and generate sound digitally allowing you to use headphones or turn down the volume as needed.
The Casio Grand Hybrid piano vs a concert grand in Berlin.
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My experience with the VPC1 (+ Ravenscroft 275) as my primary instrument for the past ~7 years has been that it's generally sufficient for practice. It's a heck of a lot better than the Baldwin B1 (4' 10" baby grand) I grew up on, and I will forever be thankful that it gave me the ability to play piano on a tight budget in a small condo in the city. I did hit a ceiling with what I was able to musically achieve with the instrument, however. Fine pianissimo control is difficult, and faster passages (particularly with rapid key repetition) are very difficult and sometimes impossible. But overall, it's good enough for generally learning all but the most complex pieces. You'd need something better - either a real acoustic, or maybe a better digital like the NV10S/etc - to master phrasing, dynamics, and speed of advanced repertoire.
I think whether it's a "good idea" to practice on a digital piano like the VPC1 highly depends on your repertoire, skill level, desired level of mastery, and whether you have access to an acoustic for polishing.