There's another thread around here somewhere where they specifically mentioned a sync issue w/2nd gear - so interesting that it's 2nd I have the most trouble with. However, NOT enough trouble that I don't love this car!
Hard to search on this b/c "V6" is too short a search term but I'll see if I can dig it up.
Edit: Here it is.
I think there's another thread where someone asked a GM person about this in a webcast? (Primus maybe?)