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I just hit about 45k and the shutter started on my SS, I got the dealer to do the flush three times and everything seems fine now. There is a specific build date when GM switched to Dextron HP fluid, which has a "improved" friction modifier which fixes the issue. It may have something to do with the life of the fluid and time and heat that eventually breaks down the old style dextron fluid causing the shutter to start during the lifecycle. Yes I do have a concern that driving 45k with the old style fluid has reduced or damaged the TCC clutch, but this "damage" is probably so small, negligible and not quantifiable its not worth thinking about.
Besides that everything else is fine I don't think you should worry at all. If you are OCD about things though, the poor NVH (noise vibration and harshness) qualities of the A8 8L80 will drive you crazy. This includes unnecessary hard and clunky 0 throttle downshifts, unnecessarily hard light throttle 3-4 shifts, and general shift quality inconsistencies. These all seem to be control related and not inherent to the mechanical design just due to their randomness in occurrence. I think a large part of the clunks and noise is due to the excessive driveline backlash as well. If you're just a normal person probably wont notice any of this at all compared to another vehicle.
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