I test drove one yesterday. Not because I want the Tremor package, which I don't, but because I wanted to try the engine.
It ran well in the 12 miles or so of mixed driving I did. No powerstroke, but impressive for a gasser.

I imagine on a regular 3/4 or 1 ton without the lift and oversized mud tires the Tremor has it would have even more power. After 25 yrs of driving nothing but diesels, I'm considering the 7.3 gas.