I had 3 Mezon 90 Lite's burn up last year behind a C54/CRS contra. On Ralph Schweitzer's recommendation, I switched to the heavier Mezon 130 and it lived to finish the year behind the C54, but haven't flown it since. In June this year, had another Mezon 90 Lite fry behind a Pyro/Adverrun. Have not had other ESC failures except when I did the wrong thing, like put a an OS ESC behind a Q80.