Back to this old question as I didn't see that Al has another quest ion. On my manual chair I took off both arms so the effect is more like sitting on a dining room chair with wheels. It's comfortable, but then I don't live in my chair.

The problem I found was with my clothes touching the wheels, and then I saw fliss suggested a guard, but I couldn't find one at a reasonable price. So since then, I've found some metal tubes in the shed from a defunct greenhouse and bent the ends 90° and stuck them in the armrest holes as guards. It helps a bit, but it's ugly.