I've put about 40 miles on it so far. I find the ride is a little stiffer than what I was expecting. And although the diesel has good pep, it seems to be a little less than my Ram 2500 with the 6.4L hemi. I think the price was fair compared to other vehicles, and the diesel actually has a $1000 discount compared to the gasser. I considered replacing my Ram with another Ram, but now the Ram diesel is only offered in the High Output version, which is a $12,000 increase over the 6.4L gas engine.
For now, I'm keeping this new truck, and my Ram 2500, which I will continue to use to pull my 28' gooseneck trailer. This new GMC does have one of the highest towing capacities of any 1/2-ton truck since it has the diesel, but I still won't pull a gooseneck with it.