Same issue here with my Tahoe. Dealer must have spent 2 days balancing tires, aligning etc, before telling me that they were going to look at the headline fix. At this point the truck has been at service for more days than I have had it. Can't I just get my money back???
I cannot believe the 2016's are having this issue. Just sad (being a foolishly loyal GM guy). The roof fix does absolutely nothing--other than trashing your previously nice looking interior. No one on this forum has reported it to work, as the other guys on this forum have stated. You will now have a truck with greasy fingerprints all over the ceiling and a truck which still has the buffeting. Prepare to be more mad than ever!
Shame on GM for not going to school on the many repurchased 2015s before cranking out the 2016s. Sorry you guys are going through this. Don't take any crap...demand your money back. There is precedent with this flawed body design. Remind them of that.