I put the Rekluse Pro on my mighty '07 YZ450 and had the opportunity to ride a couple of times this weekend. First off - the installation took about an hour. And that was taking my time. The instructions were so so and could have used some more photos. The ride was awesome. Hills - no problem. Uphill waterfalls - fugetaboutit. Cut and trust single track - no worries, just hammer into a corner, brake slide or just brake hard into the corner, then let 'er rip and bam - it's right there. Loose, gnarly, rutted, rocky, uneven, long hill climbs. Just point and roll on the throttle - no drama, no spinning, no swapping, no grinding. Just smooth traction right on up. The more I rode with it, the more I LOVED it. I traded bikes towards the end of the ride with a buddy who rides a KTM 300. He hopped on the 450 and went right up a loose, steep, narrow, rocky single track hill like it was flat ground. I was behind him (on the 300) slipping and grinding and reving and swapping. We got to the truck and all he could do was shake his head and say "it's cheating, it's cheating". Other than not being able to bump start it, I couldn't find a circumstance where it wasn't awesome for any kind of trail riding. I haven't been to the track yet, but I'll let you know after I get a chance to do that.