I've had my SM610 (06 model) for 3 trouble free years. All I have done is oil changes and 1 set of tires. It is without a doubt a well made and reliable ride. I usually keep bikes 2 years and then get bored and move on, not here, this bike will be with me for a couple more years at least. My valves have stayed in spec with almost 10K mile on it. Can't complain one bit. Love the brakes..........really love the motor.