Had these for about two or three years now and they're a good set of speakers.
My only annoyance is the length of the cables on some of them, the rear speakers aren't as long as I'd like and the front cables are a little longer than I'd want as well.
Sounds are good on them, some of the best sounding (computer) speakers I've heard apart from Logitech's Z range of sets.
Not tired wall mounting them myself, but Andrew is correct - the front centre speaker can't be wall mounted. The other four can be quite easily however.
I've got them hooked up through a set of Speed Link Medusa headphones as well and they make a very good combination.