I own two Songmics piano benches (one for each of my pianos) from Amazon. They look great , are adjustable, have a storage compartment, and are cheap, but there is a caveat. If you raise the seat high, it will start to sag after using it for a while. But I found a solution: I inserted pieces of wood to prevent this from happening. It may look strange if you look at it from the front, but it is totally inconspicuous from the side, which is what matters. See photos:

Creative solution - Iā€™m having a similar problem with my bench, Iā€™ll have to give this a try.

Rubens, want a clever solution! I have the same bench, and I didnā€™t like it because the cushioning isnā€™t great and when I practiced for along time, it would get increasingly uncomfortable. Also, it squeaks. So a few years ago, I bought one of those ā€œimported adjustable artist benchesā€ (i.e., not a Jansen but a Jansen lookalike), and itā€™s been working great for me. I still have the Songmics and use sometimes when I need extra sets in for gatherings etc.

For those of you wondering, here are the prices, roughly:
Songmics: $100
Imported Artist bench: $470
Jansenā€™s artist bench: $900

The imported benches about $100 more than when I bought mine.

    ShiroKuro Also, it squeaks.

    I haven't noticed this with mine. But it's true that I have to re-tighten the leg screws regularly (something like once every two months). Maybe that is preventing my benches from squeaking. Or maybe I just don't practice long enoughšŸ˜‚.

      10 days later

      With how few hours piano benches get used (when you consider how much the likes of office chairs, or even dining room chairs are used), I'm always amazed at how many of them start loosening up and squeaking! Before I went with a pneumatic bench, I kept a small wrench in the storage compartment of my seat just so I could tighten up the bolts every few months.