Well I have had my Yamaha Nytro MTX and Phazer Mtn Lite (son's) for 2 seasons and I am thinking of switching back to my beloved Polaris. Yamaha makes great engines but they are kind of heavy and handling sometimes leaves a little to be desired. My question is this: Is it worth the extra dough to buy a Pro vs a nice used IQ? It looks like I could save a few to several thousand by going IQ but would hate to outgrow them quickly. Also I am considering a 600 due to the reliable reputation they have, the one thing that sold me on the Yammi is the long engine life. My hope would be to buy a sled that would last at least 5k before a rebuild. We ride a mix of trails and boondocking in the Oregon Cascades. Stu