I, unfortunately, don't have dyno results. I too was looking for more info on the BM3 tune and couldn't find much out there, so sharing my experience in hopes it might help someone take the plunge.
I initially flashed the BM3 stage one stock map with only an Injen intake and noticed a big difference right off the bat. The response and pull of the car when I stepped on it was VERY smooth and noticeably more power. It didn't experience any lag like when I had the Dinan clip-on tune. I recently installed a Wagner catted DP and bought the Stage 2 map - it has changed my car. I used to have to put the pedal to the metal to pass people on the highway at higher speeds. Now, I just moderately hit the gas and the car moves.
It is more noticeable in sport mode, but even in comfort, it is a big difference in power.