i think one of my riding buddies is gonna switch to the stm ones, his were being a PITA the whole winter, never had to tow him out, but he limped home more than once. the thing would go into limp mode and he couldnt do anything with the sled. it was useless. the cables were wearing out, and the whole setup was just being a nightmare. he found out one was stuck closed, so he was loosing tons of topend. then from the one being stuck it was raping the motor and cables, i need to call and see if he fixed it yet.