I went from the ASP UDP to DMD, and I would never say the DMD is crap!
The engine spools up a little slower, but not much. I have an SVT flywheel, so I have experienced he difference when going to a UDP and going to a lighter flywheel.
Personally, I was sick of the vibrations. I got the DMD for NVH reasons, but if it extends engine life, bonus. I am very happy with how much smoother the engine feels.
I ran a UDP for 43K, no problems.
-Lance
