I actually own the Speed-Link Medusa 5.1
Firstly, they are VERY VERY comfortable.
Starting Impression was way better than the headphones ive previously owned (Sennheiser EH1430, Optimus Pro XB100) and IMO it sounded better than the HD457 out of the box, but they seriously cannot perform without an audigy card. The Realtek AC'97 didnt hack it. You need an M-Audio Revo to actually get the Subwoofers to work in the speakers because for some reason the Amp you get with them does not really power the subs, though if you swap the centre and sub channels on the extention wiring you get bass, but lose the centre channel to some muffles.
Gaming combined with EAX 3 is a dream to begin with, I gained quite an advantage in Call of Duty as I could tell where my enemies were all the time.
After 200 hours burn in or so, the rear left speaker sort of started to hiss, and now it just distorts in music
The burn in actually has a negative effect on the phones, the drivers loosen and such but the Sound becomes very lazy and flat, and really just puts you to sleep, or keeps you awake with the hissing sound out of the rear left speaker (must have blown due to some serious volume with some metal music)
Im not enjoying these cans at all anymore. They suit the hardcore gamer that really doesnt care about music all too much but it just cuts your heart out for music performance most of the time.
It does sound alright with the lighter music, but nothing special.
Anyway, Im upgrading to some Alessandro MS-1 for music and keeping these around for when my Clan plays in a Call of Duty comp at the local lan.
Nice to come out of lurking too