Just picked up my X5 this evening with the reprogramming. SA told me a few things...

He said it'll take a few days till the computer "reads" your driving style and eventually will adapt. Anyway, the X5 shifted a little smoother than before. I was able to take her through some local streets then was able to open her up on the highway. All in all, not really much of a difference. Maybe it'll improve gas mileage?