Great gains! Mike previously tuned my 2012 E92 M3 DCT and the results were phenomenal.
I just got the final version of the BPMSport Stage II tune on my X5M today and dynoed... 126 ft/lbs torque gain to the wheels. The car is now an insane beast. You can't even compare it to stock. It's like another turbo was added.
I'm sure you're loving yours as much as I'm loving mine!