Traded My F7 for Zr9, got sick of the troubles and love the Zr9 pull. Ran into a guy who just could not settle for the Zr9 and I was tired of the troubles of my F7 so we traded. I think I got the best Deal, the Zr9 handles better on trails and has an awsome pull from bottom to top. The F7 handles better in the rough but I love the power of the Zr9. From bottom to top the Zr pulles better, the F7 is a lot litter. The F7 will give a Zr9 a good run but not to top end, yes the F7 will get it out of the hole, but when you hit midrange look out, I have raced 5 F7s and until about 70-80 the F7 will be ahead, after that look out, I dont know if a lot of people are doing mods to the F7s, but I have not lost yeat to an F7. These are both awsome sleds, Cat did a great job with both, but I had way too much trouble with my F7. I hope cat does a F8 or F9 with the new style motors and chase. These are my results, what are your thoughts?