That's an average of 1 on 51 MMM's fail. But the chance of having 3 MMM's which all fail is still an average of 1 on 132651... (So I'm not 100% sure if Castle is just 'hiding' some failures or it's just very bad luck or if the user is a huge noob, but there are many other people - who got some years rc experience - and have killed 3+ MMM's)
About the motor, 1 on 2500 is very good. I'm considering buying a 2200kv castle motor and compare it with my Bigmaxximum.
And about the ESC, 1 on 51 is not that good if you ask me. But how are other ESC's compared to the MMM's fail rate? Anybody know the fail rate of an Tekin RX8 or a Quark Monster Pro 125B?