Great car.
I struggle with calling it a true M3 given the lack of S65, but it is amazing work either way, and you are one step ahead of the game (if one chose to look at it that way) as far as the next generation F32 M3.
Originally you had claimed 500-600 hp was the goal. Did you hit that? If so, that puts you at the top of the pack as far as tuned N54 output I would think.