Reviews, reviews, reviews...

Question: Use with HDMI?

Mine worked when I got them for Christmas for... a week or two. Then, suddenly they don't work at all with my 360 anymore. The site for skullcandy says that they're not compatible with the HDMI cable. Why would I want to keep them if I have to sacrifice the quality of my game to use them? And, why did they work when I first got them (no changes to the 360 at all) and now don't work?