I've had the Original Guitar Chair for some time now and my lower back thanks me every time I sit and practice/play. The support I get on l my lower back is unsurpassed. The adjust right folding chair did not provide me with adequate back support.
Mathew McAllister tried it when he stayed at my place and fell in love with it instantly. He went back to Scotland with one in his luggage!
A bit expensive? Yes, but compared to the price of Chiropractors, the back pain and fixing distorted vertebrae, it's the best investment I could have possibly made for my guitar endeavors.