yeah, it's quiet, but at 1000rpm idle up, it's a bit of a noise machine...wife always *****es at me about it waking her up when I go early in the Morning..
As for trading it in, yeah... urea issue is a non-issue... GM will have a fix soon, and it's something that is going to be an issue for ALL 2011 and newer trucks / diesels anyway.... freezing temp is the problem, they need to come up with an additive or another solution to keep it from freezing.