I have a '12 Super Duty with 108k miles and not a single issue to date. My truck gets impressive fuel economy, used as a daily driver, pulls my camper, boat, utililty trailer/tractor like a dream. I'm planning on changing the transmission fluid and rear end fluid and go another 100k miles.
I have a 2012 Ford F350 6.7L, the newer models have some small changes in the power train that increases HP and torque a bit. The upper end 2017 SD trucks are loaded with all sorts of cameras and such, with the price to match.
My truck has been basically trouble free, we run all over the western mountains all summer long and have been up to Banff and the Canadian Rockies. The only problems I've had were a corroded battery strap, and a ghost Advanced Trak error message. I did have a hose blow on the turbine when we were in NM. Everything except the Advanced Trak error have been fixed under warranty. The mystery error is most likely a wire with bare insulation that once in awhile shorts out. The dealer couldn't find it.
This is my first diesel and I am a convert. The truck has pulled our 11K fiver up and down mountains all over the country.
If you are thinking about a used truck be sure to get a 2011 or later when They have the 6.7L