PLEASE HELP ME!! (pick out setup)

[BrianG]

Having one, maybe two ESCs go bad could be attributed to faulty units (especially if they were v1 or v2). But more than that and I'd start looking really close at the setup itself and maybe even the component choice. Heck, unless I know the specific cause of a failure, I'd be taking a hard look at the setup after one failure. The MMM is rated for 120A @ 6s, with higher current bursts. That's a lot of power. But if some other part is causing them to burn up/go bad, chances are the same thing is gonna happen no matter what you get.

If all components are fine, and it's just a matter of really high currents, then I'd say to step up to an 8s+ ESC with the proper motor kv to match. That way, you get equal or more power with less or equal current. High current is the killer; it creates more heat (losses) which can be difficult to shed with low airflow and/or high ambient temps.

Your trouble could simply be a combination of a faulty ESC or two, low airflow, and maybe overzealous gearing. Each one of those not enough to cause a failure by itself, but together...