The 6.0 liter diesel is a nightmare. The Canadian ones seem to be fine, but the American ones have lots of problems. Batteries die, fuel injection problems, stuttering engine. If you're going to buy a warranty - purchase the Ford one only. We made the mistake of purchasing the dealership one and we've had lots of out of pocket expenses. I can't go two months without something going wrong.
Great truck. Tows excellent, good mileage, well made - I have the 6.0 diesel engine with auto transmission - quiet compared to Dodge and seems to be a better engine than my last two F-250's that had the 7.3 diesel engine. Don't like where the fuel system water drain is located but that is a minor inconvenience. Lots of room inside, and it has plenty of power.
The Power Stroke is an awesome engine! This is the only truck I have owned that not only holds it's own but actually accelerates going uphill weather towing or on it's own. My wife has fallen in love with this truck in less time than it took her to fall in love with me! And she cried when we traded off her other truck, now she would not trade this truck for the world, I think she would shoot me first! The BEST truck we have ever owned! And that is saying a lot because I have a 1997 F-150 that has been so great it is still running on the original battery!
Much improved from my 2002. Surprising acceleration for such a heavy truck. Haven't found anything I can't tow with it. Of the 3 HD truck lines, Ford still has the most creature comforts, excellent for a work truck but great to haul around the family as well, especially on long trips with a 5th wheel.