There were known problems with the head units several years ago. I have the Skipper 1000 in my 2005 GT, and I went through 3 (or was it 4) head units back in 2005 before I got one that didn't skip. It had trouble with store bought CDs, burnt CDs, and anything else I put in it. One of them jammed up so bad they had to send it out to have my CDs removed and mailed back to me.