Ear Force PX21 for PS3

Any one have these ? Thinking about getting a pair as I have a set for my 360 and I love'em - not sure how they'll hook up though as I have the 120g Slim and dont recall any adio outputs, just the HDMI. They plug into the USB port on the front then?

Thanks for any replies.

I have a pair of PX21's for my PS3. They are fantastic. Great sound, and full featured. With TB you get the microphone monitoring, chat boost, stereo expander... all kinds of stuff. I'm going to pair it with my DSS to make them full 7.1 soon! Def grab a pair.

I'm considering these too. Also considering Tritton AX180s and Tritton AX720s. Help? :)

EDIT: I'm mostly worried about:

- any background fuzz in the headphones

- a high quality mic

- little sound leakage, prefferably pretty decent cancelling too so I can't hear what everyone else is doing

- a good soundstage (ability to find directions etc). I imagine most of them will be fine, from what I hear after you get used to them you can hear directions pretty good, and using contexual knowledge it's easy to find them (for example, if there's a catwalk in front of you, and grass behind you, you might strggle to know that they're behind you instead of in front, but if you hear the rustleing of the grass you know they're in fact behind you).

- comfort and sound quality