Edge makes a great product and you will def. see some power/mileage gains. If i was you i would look around though, edge isnt the only one that makes diesel tuners. Bullydog is also great for diesels.
There is a dealer local to me that has one NIB missing the USB cable for $125 vs the $479 retail. Good deal in my opinion. I have lots of USB cables around the house.
I was thinking either bully or edge. this one at this price would make the difference on the brand.
Im not looking for the increased power as the truck has more than enough compared to my 1989 7.3L IDI I am looking for every bit of mileage increase I can get out of it as I see us heading back above $3.00 per gallon for fuel in the not so far future.