The Logitech g35 is an awesome headset, Ive owned it for about a year and its amazing. You can wear it for hours without ur ears hurting. it has Macro keys, Microphone, And 7.1 surround sound for FPS games ( works really well) And you can control the base/treble on the sofftware, it also has morphing voices too. There is two types, one is wireless and one is wired. Its also noise cancelling when you have music playing or when your in a game, you cant hear nothing outside.
I have both the G930 and the G35... I love them. Gave my brother the G35's and am now using the G930's.
The macro keys can only be set for iTunes and other audio services (TeamSpeak, Vent (I think), Winamp, etc).
Sound quality is great, but not excellent. The mic sounds great!
I've been using the Razer Orca since my Steelseries Siberia's bass blew out. Both have great quality sound. (I had the Siberias for 4 years, back when they were icemat). Along with an x-fi pci card.