looks like a good idea but for my taste it's too low. I use a drum throne with a bicycle style seat it's very adjustable in height, works well and I've used it for about 9 years now.

The photo of the guy on the floor reminds me of a gig I did for seniors. I had an x-stand style padded piano bench. I didn't fasten the clamps properly I started in on my first tune and the thing collapsed. I was fine but from the look on the age of those older folks I was hoping no one would have a heart attack seeing me fall.