Send it in and have them warranty it, then save your money for a good esc. I have a MM2 in my Kraton and an MMX in my Senton. You wouldnt know they were the same vehicle after putting in decent esc's. The throttle response is immediate and instant power...something the stock esc is horrible at. There are a number of good esc's out there, all of them better than the one ARRMA put in there models.