I have used it twice for a kawai 18 kg. Overall, it seems good and relatively stable. The reason I am taking off one star (and the time remains to see if I will return it) is the handle that adjusts its height. It is a plastic little handle and it doesn't inspire confidence at all. I feel that it can break very easily.

There may be cheaper solutions by 10-15 euros maybe, but in no case with the same quality of construction / durability / ergonomics.
Future Proof (can withstand heavy weight) solution.
5/5!

The base is excellent!
For the money, it's a one-way street.... (40 euros).
Durable and with beautiful details. It sets up very easily and can also take an extension for a second keyboard, which is purchased separately (Gravity KSX 2 T).
I use it for the studio.
I highly recommend it without hesitation