I have over 1500 miles on it, runs great, picked up 2.5 MPG according to the lie o meter. The turbo braking only works when in tow haul mode, which is nice, and it does a great job. If you are above the 50k mark and start loosing coolant delete the POS and enjoy not having to deal with the emissions crap. That being said it does take a little while longer to heat up in the morning.
Total cost was about 1700, and that was calling in a few favors on parts pricing, retail should have been about 2k. The dealer wanted $1350 to do the EGR cooler replacement, and I deleted that and 100% of the exhaust crap. The cost difference is about what I would have spent in DEF in the next 75k miles.
I now have straight pipe off the turbo all the way back, no muffler, resonator, DEF, exhaust burner, etc. I think it probably took a good 150 to 200 pounds off the truck getting all of that crap off. Exhaust note is nice, but hearing the VGT moving makes me think of new Fords.