I agree with Polaris-Man. I have the same machine as him and i think their surprisingly reliable. The motor is a jewel and i never have any engine trouble. They are just more finicky in the tuning department. But, when tuned well, i enjoy beating some 600's with a 440. Plus, since there build to take a pounding, it should hold up even longer than a trail sled.
It seems AC just needs to work out all the bugs. They seem to have rushed through the brutal testing phase in the design work. Plus, the task of keeping things undercover.
I agree with Sno-x-exrtreme too, it wouldn't hurt to wait a year or more to see how reliable the rest of models become.