So far no problems at all. But I understand the hesitation to buy with no way to return it. It was a big gamble for me, but now I'm glad I risked it!
I contacted GMPartsDirect about my NAV DVD order today, and they replied that my Dec 30 order didn't get processed until Jan 1.

I find it hard to believe anything happened on the 1st, but that is what they said.
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."