blackbeauty... I think you're referring to the herky jerkyness at first within the first 10 minutes or so? Then it goes away and drives like normal? Alot of our X's do that and the dealer will have trouble replicating the problem. My guess is the programing of the transmission. But that might not really change anything. This issue has been gone over many times with no real solid solutions. All I know is mine has been doing the same thing and I've pulled my codes multiple times and none of them relate to the issue.

You're probably right, the tranny is most likely not slipping. You would definitely notice that and it would be much more agressive and missing gears..Plus you'd probably get the dreaded "trans fail safe" error on your dash at some point.