The Razer Megalodon is the best headset that I've ever owned. I regularly do long gaming sessions of 8 hrs or longer and this headset stays comfortable throughout. The mic is excellent and even though you don't think that it will reach your mouth, this doesn't stop it picking up your voice perfectly. Sound quality is also very good, with great bass.
Pros: Very very comfortable Great build quality Great sound quality Comes with hard travel case (best feature in my opinion) Amazing presentation, box etc..
Cons: Price (but you definitely get what you pay for) 7.1 virtualisation will only work with at least a 5.1 input signal (e.g. when watching a DVD, or a dolby game like Crysis), if you run the 7.1 off a stereo input it makes voices sound like they're underwater!! (although normal sounds are ok, as all it does is copy the front stereo channels to the rear channels)