Yep, still like it. I've got 2 bitches about it. The fuel tank is too small, it's only 26 gal. Not really anybody's fault, there's no more room under there to hang a bigger one. 2nd is that you cannot completely disable the traction control. This is my 5th vehicle with traction control and I've decided you just have to realize that the algorithms written to govern traction control are not written by folks who drive on ice, compacted snow, or gumbo snot-mud. IMO, they're written to help folks stop/maintain control on wet pavement and nothing else. Neither of these would keep me from buying another, they're just annoyances. An 8' box model would solve the fuel tank issue as I believe they're 36-37gal, that'd be way better.
MPG hunting this fall was 12-13. Not bad for the stop, go, stop, glass, go, cut-off the coyote, stop, etc. My last road trip with it was 550mi round trip @ ~72-73MPH (Interstate in MN is 70) and I got 17MPG on blended fuel. I had it out for a spin today and on the current tank of fuel it's all been in town driving, lots of idle time for warmup and I'm averaging 10.5MPG. I've got 23K on it now and other than a DEF re-flash that all of the 6.7's got it's just been oil and fuel filter changes. I'm not following the oil life minder. I change oil every 5K no matter what and change fuel filters every 10K. No squeaks or rattles yet and it's done everything I've asked of it.
I get asked about DEF a lot, IMO, it's a non-issue. You can buy it almost anywhere they sell diesel fuel. I buy it locally for ~$15/2.5gal. I fill it myself when I know I'll be taking a long trip, other than that I let the dealership top it off during oil changes.
I had an '06 F-250 with the 6.0L diesel prior to this one and the '11 rides better, turns shorter, and must be better balanced, it's hard to get the back end to step out, even when you're trying.