With the G330, Logitech delivers a comfortable headset with surprisingly high sound quality. I would definitely recommend this product provided you're willing the spend the cash, which is considerably high for a wired headset.
I suppose I'll discuss the comfort first since that seems to be the major marketing point for this product. This is the first set of behind-the-head headphones I have ever seen that are adjustable. It seems like an obvious addition, but a welcome one. Now even people with bigger heads (like me) can look at "one-size-fits-all" and actually believe it. For me, the major issues effecting these behind-the-ear type headsets is the tightness and sharpness where they hang on your ears. Logitech seems to have nailed down both of those flaws. The tightness is adjustable and the hook around your ear is not even noticeable. All I feel while wearing these is the foam on my ears, which is soft. In addition, the ear pieces pivot slightly to take into account different types of ears. So, without a doubt this is the most comfortable headset (or behind-the-ear headphones) I have ever worn.
Now onto usage. The cord from the headset has a control box to allow for volume control and muting. On the control box is a belt-clip for attaching to clothing. It's light enough that if it's dangling, you probably won't notice it. Down from there on the cord, you'll find a velcro strap for neatly storing the wires -- a nice touch. And finally, the output plugs. These are 2 stereo jacks with embedded, color-coated labels for each to let you know that one is for the headphones and one is for the microphone. With these jacks, you can plug them into your sound card. But, like me, you'll probably want to use the provided USB adapter. The jacks plug into the adapter and then you plug that into a USB port. Windows (I'm using Windows 7 RTM) will immediately recognize this as a sound device, so there must be some kind of sound card type logic within the USB adapter (which is why I suspect the price is so high by the way). By default Windows will make this your default sound device so you will hear all your game audio through the headphones and all the voices through your PC speakers, which is the exact opposite of what I wanted. But with some simple changes to the sound devices in windows, you can swap that around so the game audio goes through your speakers and the voices go through your headset. You will likely also need to configure whatever game software you're using to work that way as well. Both Steam and Games for Windows Live allow you to do this. Just go into settings and select the G330 sound device for voice input and output, then select your audio card for game audio (music and SFX) output.
Now, had the audio configuration never defaulted to the G330 being my default audio device, I might not have had a chance to experience the sound quality that comes out of these bad boys. I have a 5.1 surround sound system, but if I didn't, I would be glad to use these for my main gaming audio device. They really sound tremendous. I was very surprised to hear that kind of quality audio coming from these little headphones. It's a very full sound, and loud without distortion. The microphone is also top quality. I recorded my voice and played it back to hear how it sounded. It was clear and defined -- definitely better than what I'm used to with Xbox Live headsets.
About Xbox Live... my only bad point about these. There is no adapter to turn them into a mono headset for use with Xbox Live. I tried buying a cheap splitter to turn the 2 3.5mm stereo jacks into 1 2.5mm stereo jack, but the adapter was a splitter and ended up combining the signals into a choppy output. So, you definitely need some kind of special adapter. I don't know if Logitech sells it or not.
So, other than that, these are top notch. I definitely recommend. Another fine product by Logitech.
