I have read thru mgm warranties on many forums, very difficult to make a claim as "they don't go wrong" "user end" is the problem" that's from mgm themselves, even so, I would recommend these esc's, some brilliant batteries out there, the graphene's certainly are right up there, if you're going to do brushless then you have to do it right, otherwise you will get "brushless is crap I went back to petrol" each to there own though