I have the JVC 5.1 adapter and 555s and they sound great to me. I use a toslink to mini-toslink cable to connect the Xbox cable to the JVC, and still keep the component cables hooked up to the tv and the tv will still play the sound. I play mainly driving games (Forza 2, Burnout) and Oblivion, and I also watch a lot of movies. Originally the purpose of the headphones was for late night use, but I now prefer the headphones for gameplay at all times of the day. I haven't used the mixamp or other headphones, so I can't really give an accurate comparison. By the way, I got my JVC on ebay for $50+8 for shipping. Hope this helps.