One of thing I noticed when I first got this headset is that the ear pieces are a lot smaller than the ones on my old headset which was also Logitech (forgotten the name). Like most headsets the size is adjustable so it can fit any normal sized head.
The sound quality through the microphone is really good and it doesn't pick up deep breathing sound like my old headset. Also the sound that comes out of the headset is at a good quality too. When I was playing in a clan match I could make out every word our team said.
As well as having really padded ear pieces the headset instead of just being plastic has padding on the bottom of the top piece of plastic to make them even more comfortable if you are going to wear them for a long time.
All in all if you are looking for a good quality, reasonably priced headset then I would recommend these.
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Left: 2 x 6 pin mini-DIN (PS/2 style) - female, 1 x 4 PIN USB Type A - male - Right: 1 x 4 PIN USB Type A - male, 2 x 6 pin mini-DIN (PS/2 style) - female, 1 x 6 pin mini-DIN (PS/2 style) - female