I have a V1 MMM (with no mods) that is going strong with lots of run time on it in my 8ight. I am using the stock firmware, or whatever it came withe when I bought it.
I also have a V2 MMM (with no mods as well) that is going strong too.

I had a short test with it in my 8ight, and a short test with it in my CRT.5. I will have much more testing with it in the CRT.5 this upcoming weekend.
I also plan on buying one more MMM for my 8ight-T which will be running 6s. The 8ight and CRT.5 are both running 4s at the moment... but I can't be happier with the performance of the MMM's I currently have.
Edit: If anyone cares about the set ups, I am running a Hyperion 4s 5350mah pack in the 8ight with a Hitec HS-5997MG servo and Tekno Neu 1515/1y motor geared 47/17. And the CRT.5 has a Neu 1509/1.5y motor, Flightpower 4s 4370mah lipo pack and a Hitec HS-5245MG servo geared 46/16.