Bought my 2017 in mid November, and now have over 10,000 miles. Drives and runs like the day I brought it home. No issues whatsoever. This is my third Ram. First two were diesels; a 1995 2500 and a 2011 3500. The 95 had a few issues with the front brakes, and the dreaded death wobble which can plague solid axle 4x4 trucks, that cropped up at around 50K miles. Isolated and fixed the DW myself. Otherwise it was dead nuts reliable. The '11 was a much more refined truck, better in every way than the '95. No issues with it either. In the 1500 now because I no longer needed the grunt of the diesel, and it is significantly more refined than the '11.
I'm also very satisfied with the 20 to 21 mpg highway mileage of the 2017, and thats with 3.92 gears.