Through various web searches, I was at least aware of the "wind noise problem." I asked the dealer about it, and he said he was unaware of any such problem in the '08 (for what that's worth). Still somewhat suspicious, I did freeway test drives twice to check out the individual vehicle, found no problem, and there haven't been any wind issues since delivery. As for the "transmission hesitation" issue, I haven't noticed any thumps and bumps, but there seems to be some quirkiness in changing its mind about downshifts occasionally. My 460 was delivered with ver.07.1 nav software. (Oddly, it then seems to then provide for a wireless map update that starts when you press the "I agree" button, without any description of what you are agreeing to...)
This is a sample size of one, but it might provide some minor reassurance.