thats the 64,000$ question!! some like yours have had excellent luck. mine only lasted a yr before the clicking started. amx1397 and rudy have gone thru mutiple units both on street tires and dr's. i will say i didnt have any issues until i cracked 350 hp and added dr's. of course track setup i believe is a big factor and i use many different tracks. were my issue started was reynolds track in ga. that day they were laying down vht like it was free!!