I'm sending mine all back when they have the new versions.
I just had my first MMM shut down on me. It had a good 8-10 hours of use on it. The BEC failed. It ran normal all day thru the 3 qualifiers and I shut it down and unplugged the battery as normal. About a half hour later I went to go change the battery and start prepping it for the main and it wouldn't turn on. Nothing. Just dead. If i started the fan spinning it would keep it spinning for a while as if it had a very low voltage running on it still and when I plugged a Rx pack into the receiver it actually started up and spun the motor on the bench for about 5 seconds then it quit again. I yanked the MMM and replaced it with another MMM I had all set up and sitting in the pit box just in case. (as it turns out a good decision) I am sending the dead one back and having it replaced and then when I get that back I am going to yank the other one working or not and have it replaced. I just don't trust that it will keep working. I thought I had a good one. And by comparison to what happened to others I did, but it just couldn't go the distance and I don't trust the other one to do it either.
On the brighter side... I won the B-main and bumped up and then took 3rd in the A-main for 1/8 buggy and took 1st in MT with the G2R Revo.

Very good day for me. It made me forget about the dead MMM.