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I bought these primarily for the voice chat function of my PS3. Normally I used a Bluetooth headset, which to quote one of my mates, sounded like I had "found it in a cereal packet". I'd heard about the benefits of having a proper gaming headset, and with not too much cash to spend, forked out on these, and I'm very glad I did.
First off, the voice chat quality is much improved, my teammates can now hear me properly. The mic is on a sort of bendy metal thing attached to the left side, and is easily pushed up and out of the way if you don't need it. The headset must be plugged into a USB port for the mic to work, luckily you get a very long cable with this headset.
Next up, the sound quality. My god, I've not heard anything this side of audiophile grade headphones which sounds as good. The main thing you need to understand here, is that without the rather pricey DSS processing unit attached, this does not give full 7.1 surround sound, it merely amplifies what you'd hear from the TV. That said, there is some degree of surround sound, although it could be much improved, for instance on Battlefield 3, I could hear roughly which direction a helicopter was hovering above my head. However, it got to a point where one ear would have no sound and the other would have sound, but move back a few millimetres and it is reversed; therefore it isn't what I would call true surround sound (I'd expect one side to fade more and more but not come to an abrupt stop like this). But at this price point, it's not a deal breaker. Other than that it is great, you hear footsteps of nearby soldiers much more clearly, also despite the issue with the 'surround sound' not being 100%, you can sort of gauge how far away explosions are from the player, you hear bullets flying around you, and so on.
I have tried these with my MacBook Pro for music and FaceTime calls, and again it shines here. Sound quality beats pretty much all headphones I've ever tried, and again voice quality is pretty unbeatable.
Build quality however, is something that could be improved on. While not completely terrible, the plastic feels a lot cheaper than the £35 RRP would suggest. Also, the cups themselves don't feel attached to the headband quite as securely as I would have liked, however it has been 8 months now, and mine are still in one piece.
In short, if you're into FPS games and want to up the ante a bit with sound quality, get these rather than do what my mate did and waste nearly double the price and countless hours hooking it up to your home speaker system. I plan to keep on using mine till they die, and depending on my wallet size, they'll either be replaced with the same again, or the wireless model, which I would imagine are a bit more useful when you sit further away from the TV.