The single biggest issue I see with people blowing out diffs is they always run their slipper clutch too tight !

I have had my EREVO since the very first day they were released (bought the brushed version as the brushless version wasn't available) and I have never had a diff go bad , but I make sure that slipper is set right so it does its job and absorbs the shock loads put on the driveline from landing on throttle . I dont know why people think standing backflips are so cool when it probably is the most harmful thing you could do to your RC .