I was intrigued by this, and got it to try to enable practice with less strain on my shoulders and back.
It is a very well engineered product, as far as I can tell, though it would perhaps be reassuring if the parts were a bit more solid. But that would make it less portable. Also, I've got two K&M guitar stands that I've had for many years, and they have held up well, so I'm optimistic. So far, so good. I would certainly recommend regularly tightening up all parts for this though.