It's fair to say that I am rather brutal on my computer chairs. They last long enough to warrant the purchase but it what conditions they survive in are haggard. My current chair has been fighting for survival now for near two years, being held together with robe wire and glue, I'm just waiting for it to hewn me to the floor as if I were some over encumbered tree.
I've purchased just one computer chair in my life and it has lasted for the past several years with no wear or tear to show. Of course, I spent nearly $400 on this chair, so it better last for quite a while longer. I've advised Vance in the past to spend the money and get a nice, sturdy, all metal frame chair so that he has a harder time breaking it.