I too am interested but have not heard anyone here proclaim that they have this tune on their N55 OG M2 and it's the "bee's knees"...
The only posistive review I found sofar was this one (it is quite positive) and it's on a M240i - here the OP asks about the tune originally and then just pulls the trigger and does it and then posts his experience:
https://www.2addicts.com/forums/show....php?t=1615956
Of course in one earlier post the OP says, "I have nothing to compare the tune with as this is the only one I have tried, but this this is incredible! " and then in a later post says, "But I believe. I have tuned many cars and normally 40-50 hp on a tune is great."
I understand that Noelle is new to North America but has been in Germany for quite some time - anyone out there in Germany have the M2 tune for a year/few thousand miles that can speak to how it affects reliability, drivability, etc?
I'm not an early adopter so until I hear more positive N55 reviews prob gonna sit on my hands on this...