We bought this stand for use with our Roland RD800, which is full size (88key) and weighs a decent amount. It is, simply put, superb.
To adjust, it's just a case of pulling the handle up and changing the height. No more spanners or screwdrivers required! It is very straightforward, and very stable.
I particularly like the adjustable rubber grips on the top surface to ensure that your keyboard, whatever the size, doesn't move around.
At the end of the day, this is a stand for a keyboard. It does the job very well. And as with all K&M stands it is solid and reliable. I have been buying K&M stands for 20 years and I've never needed to replace one yet.