Just got back from the T57 update at Leith M/AR in Raleigh. What a frustrating experience. A employee started arguing with me about a replacement part they had agreed to pre-order for me (a dash knob). They hadn't ordered it.Just picked up the car from Hendrick in Cary, NC. The Campaign T57 software and drivability enhancement was completed which included reprogramming the Power Train Control module and inspection on the exhaust temp sensor (per notes on the paperwork).
Also, when I made the appointment I specifically asked them to update the infotainment system at the same time to keep me from having to make two trips (I live 30 miles away). After waiting for 2.5 hours they brought the car around, washed, but they had not done the infortainment update... "Oh, did you want that done, too?" Grrrr! So now I have to take it back and wait 5 more hours for that update.
As for the T57 drivability upgrade - it's great. I think think it even sounds better. The car accelerates much more smoothly from a stop now, even though I was not unhappy beforehand.