Just a quick note to add a voice to the chorus.
I've got fewer miles so far, but I've been absolutely satisfied with my 6.4L 2500. It tows like a champ, just almost effortless, even on the hills. Not that my trailer is a challenge for it, to be fair. As a daily driver, it's been great. Better gas mileage than the half ton it replaced, towing or alone. And it rides well enough that my wife doesn't complain. THAT was a surprise.
It hasn't been back to the dealer for anything yet. Although I do have an outstanding recall for something in the gauge cluster. Haven't scheduled that yet. But no problems at all. Just an oil change so far. Tire rotation next time.
I'd buy the same truck all over again, if I needed one. It doesn't hurt that my Ram dealer is awesome, where the local Ford and Chevy dealers would charge me for blinker fluid and muffler bearings if they could get away with it. "Market adjustment" and "Advertising adjustment" markup, my a**.
Hope to have this truck for many, many years. And the first year is a good start towards it.