It doesn't have the trinary options of "back support that jabs into your back like a knife" or "slightly less jabby but still painful" or "nothing." It doesn't

It doesn't have the trinary options of "back support that jabs into your back like a knife" or "slightly less jabby but still painful" or "nothing." It doesn't have the steel bar at the front of the seat that cuts off leg circulation if you try to sit forward. Seems more adjustable generally, and I feel that the arm rests are more fully adjustable in particular.