I've had an AK Racing one I bought about 3 years ago (they were a lot cheaper back then, paid £130 for it I think). It's not worn at all in that time and I use it every day, also kept it's shape. Best and most comfortable desk chair I've ever had. Though I'm not heavy, which probably helps
It's not a leather one though. I don't like leather chairs, they never feel as nice as a good cloth one. Especially in summer when it's sticky.