yea, i just installed one the other day. the GM class 2 databuss.
works perfect and was a piece of cake to install. it comes with a little speaker for the chimes.
if you want to change your stock deck, for sure buy this harness. i think its worth the money unless you really want to put your stock deck in your trunk or something like that?!?! that sounds like a pain in the ass though... aaaaaaaanyways...
good luck