My Flux has had 4 packs through it so far only but everything seems to be fine. I have only ever run it on 6S from day one. I know it is early days but is seems to be holding up just fine.

In my RC8Te I am running the MMM with the Castle 1518 and again only on 6S. No issues what so ever. It doesn't even get warm enough for the fan to come on most of the time.

On my Serpent 960 I have ran the MMM with Castle 1512 (2650kv) motor on 6S and only 6S. Again holding up just fine.

Two of my MMM's that died seem to have been a BEC related issues but now I run external one on all of them.