I tried one of these, and I'm tenacious as heck, but I just couldn't adjust to it. I'm curious about long-term experiences with them, but most of what I've read

I tried one of these, and I'm tenacious as heck, but I just couldn't adjust to it. I'm curious about long-term experiences with them, but most of what I've read online has been from people still caught up in the novelty. (FWIW, I use a Haworth Zody chair now. I got a great deal on it.) FWIW, I'm 6'3", and while I got the largest ball size, that may have been a factor.