i dont know anything about a PMT but I have an Edge/Attitude in my 03 6.0 and have had for a couple years. I put it in at around 85K and now have 140+K on my truck. I have been happy with it. It provided a modest boost in HP for towing and 2 + MPG when towing but nothing significant when empty. I get 16.5 running around empty and 18.5 on the hightway empty as long as I dont push it over 75mph.
I am not a racer, only had it on setting 4 a couple times just to see what it was like and 5 down throttles so much it was kind of a waste to me so I never used it again.
I use my truck everyday and cannot afford to tear it up so i just liked the extra little umph for towing that seems easier on the truck. I run it on setting 1 90% of the time, 2 or 3 when towing heavy loads.
You can see the mods I put on my truck in my signature. It runs great, no complaints. I guess it all depends on what you are wanting to do, race it or use it.