Got mine done earlier this week (Dropped it off Monday, Picked it up Yesterday)
They had to keep it overnight because they were short on technicians after telling me they could get it done in about an hour and a half when I called in the morning. Gave me a 2019 Q7 as a loaner.
First impression, throttle is smoother, slightly more linear, lag seems to be less. It wasn't dead cold when I picked it up, only drove it 12 home miles yesterday.
Drove it from dead cold this morning. The warm-up also seems more smooth in throttle response, no jerkiness or studder/surging. It still gets into 3rd gear and wants to stay there, unlike before any fixes. After 23Z9 it now holds 2400-2500 rpm before getting into 4th gear. After the previous fix it would hold 2700-2800 rpm. Improvement there, I hate it holding gears like a gasser.
All in all, I would think anyone would be happy with this fix if they never felt how the car was before the whole dieselgate thing came up. Most people would probably be satisfied with what Audi has done to correct the behavior induced by the first fix.
Only the pickiest people would still be upset with Audi for how the car feels after all this (can you tell I'm picky?
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I swapped my pre-fixed TCM back in this afternoon and went back to early shifts and more confidence in what gear it decided to be in. The throttle response and linear feeling remained and I don't feel the jerkiness I would get sometimes. Lag appears to be lessened, though I think it will always be there to some degree.