I have little, if any, concern about the 6.4L diesel. I would have waited, but I needed a truck when mine sold. I bought mine for under invoice. That is still a lot of money, but really it is not THAT much more when one adjusts for COL. I have never bought the first year of any vehicle, but did this time. I figured Ford knows this is one of the prime vehicles which will save them--or not. So far, the quality finish work and way the truck runs indicates Ford is taking this quite seriously. It is not my goal to try to get anyone to buy an expensive 6.4L truck. I would simply say that since I am one of the first on the forum to do so, I would like to pass on to others that are looking at a new 3/4 ton truck that this one should be one they should drive and review. Chevy, Dodge etc. are each making good trucks. I think this truck is the most refined heavy duty pickup I have driven. To spec any diesel heavy duty truck in 2007 to the highest spec level will push the price to at, or above, $50,000 retail. Interestingly though, my 2002 7.3L diesel retailed at almost $42K, and it was not the same trim level, so the prices really have followed inflation, with a little extra for the diesel emissions expense. Yes, diesels are complex engines nowdays, but the 2002 7.3L was not a simple engine, just more simple than now. What we have gotten, at least in this engine and I would suspect equally so in the Cummins and Duramax both, are engines which are more powerful stock, much more quiet, and cleaner (although I wish the EPA would leave this issue alone for a while). How many times have we said, "Man, that drag car, F1 car, supercar, Bonneville car, lawn mower, whatever has twin turbos!!! Isn't that neat!!!" Now a pickup has that from the factory, and I am sure more are to follow suit.
John M