yep, my esc took a crap (could of been the 6s i tried hehe) so i opted for the bigger 85-100 new esc for when i bump to the 600 motor soon. the 550 is ok but its weak for any serious flying with a 4s battery.
being i already bought a 6s battery i cannot decide on a 600 motor to handle the 6s or get a 5s and try that for now with the 550 as thats all it can handle