I think you will like the Ace. I believe it to be about as stable as practical in a machine of this type. I owned a Rzr-s before the Ace. I'm not sure what the salesman meant by "It's more stable than a Rzr". My opinion is that the Ace is very similar in stability to the Rzr. There are several different models of Rzr's varying in width and height, so a direct comparison is difficult. One can roll anything over given the right conditions. One thing is for sure, it's safer than a quad, if you do roll it over.