I purchased my X3 in Feb 2012. I noticed some acceleration hesitation issues & noted that Consumer Reports mentioned it in their evauation. I googled the issue & found Bimmerfest, where I learned about the software fix. I contacted BMW who claims that the software fix for this problem is already in the model I purchased. I don't know how bad it was before, so I don't have a means of comparison. I would like to know if others are still experiencing this problem after the "fix"? If so, have you had any luck in finding a resolution? If no one is experiencing this issue, maybe I am expecting too much.