i got mine from them. it was on my doorstep in 3 days, packaged very well, NEW still in the ACdelco bag. the denali looks badass with the 120mph speedo and white needles.
then check out this thread http://www.gmfullsize.com/forum/showthread.php?t=167567 and get it programmed for ~$60 including shipping. or you could just not get it programmed. its not really gonna be an issue till you try to sell your truck.
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