Hard agree. It's cheap'n'nasty stuff compared to what you'd get on a car seat. Fabric or mesh much better (especially in summer - or right now when you're going in and out of heating). The slipcovers not only stop me getting covered in little bits of black and blue tacky stuff, it's a lot more comfortable for long work sessions.
Thing is, the more expensive gaming chairs have arms that adjust up and down but not completely away, so if you were thinking about using it for guitar practice they're not completely ideal.