no problems with mine
I have not noted any problems with mine and have 1600 miles on it so far. I find it shifts very smoothly with the best evidence that I don't even notice the tranny. I had an 08 Enclave where the set-up for the tranny was so bad it was difficult to drive until a reflash was offered that solved most of the problems. I am also impressed with the sport mode and do not fine the button shifter cumbersome at all as many reviewers have.