So far my experience with mine has been good. They are more reliable than the 800's and really not much less in power. I picked up an '08 700 155 for the same price last year with a blown motor. For the money I've got into it, I've got a reliable sled, with good power and handling. We ride in Island Park area, boondocking in the tree's. Handles real well, easy to throw around and yet has the power to climb.
For the money you would have into it you could add some power adds to it later and still not have much into it. I'm adding a Silber Turbo and 2.5 Peak track to mine now this fall.