This headset is pretty bulky-looking when you are wearing it, but it makes up for this by being really light and very comfortable. With some headsets excessive use can leave your ears quite sore in places, however I have yet encounter any such problems in this case (and i have used them for quite a few extended gaming sessions so far).
The sound quality is excellent, the difference I noticed going from my previous pair (which admittedly were bought on a much smaller budget), was so great it spurred me to open up amazon and give this a good review!
Of this headset's audio am most impressed by the bass; it really adds alot more depth to those explosions :)
The detachable microphone is a good idea; i haven't had any problems with it, however I usually leave it connected so i don't lose it! The sound quality you get from it is pretty good too.
The size of the headset (the band which goes over your head) can be adjusted, as with most headsets. I needed to make the band as short as possible to get the perfect fit, and my head isn't particularly small, so if you have a smallish head it may not fit too well.
Overall i'd say its well worth your money even if you aren't much of gamer; it works very well for music and Skype too.