The MMMv1 I sold to my friend is still running strong. It's stock, but has the 1.19 firmware. He's running it on 5s lipo with a Medusa 60-1600kV motor.
He chipped a fan blade the other night, but I had an extra MMM fan, so he'll just swap them out.
My still is fine. The only "mod" is that I accidently severed the switch wire between my spur and pinion. So I am running an E-Maxx on 4s with a 1515 1y.