Bought the Ahs502i (only one left on the shelves)
Bought the Ahs502i today for AU$50. Using it right now. Very comfortable indeed. Certainly not getting the problem that I got with the Logitech Premium 350. But as Rob said, it does start to get quite warm after awhile. And the fact that my house reaches over 35 degrees celcius doesn't help things either (no air-con).
The sound quality is unbelievable. It's on par, if not better than my 350. The micrphone is also excellent, making for great VOIP calls and online gaming. Not to mention, very comfortable. All-in-all, a very good headset.
My only gripe would be the warmth on the ears. But, i'm sure i'll get used to it after awhile.
I haven't used the Ahs602i, but this is a headset that definitely should not be overlooked during your headset buying decision.