Yeah I received it three or four weeks ago and I installed It for 2 weeks - preformance seem about the same, trans shifts smoother. Has other. Improvements but not obvious. Make sure you follow instructions or can lockup programer.
ref GDE, I am also impressed with the up-shift smoothness from 1st-2nd-3rd it is butter smooth. 4,5,6 were never an issue most likely do to additional loading providing a bit of a cushion, and like GMforlife said the hard downshifts are gone. The other thing GDE did for me is they compensated for my 36 Gallon Titan fuel tank. Today when I blew the tune in, I filled my tank and the distance to empty on the DIC is 892 miles... You gotta love that!
I absolutely love my GDE engine and transmission tune. Fantastic customer service.
Just a tip: Ask them to remove SCR sensor trouble code activation. The DEF is shut off anyway and by eliminating potential trouble codes, you will eliminate the possibility of having to go to dealer should the (non-functional) sensors fail or go out of calibration.