I went out today to Bean Canyon, SoCal-desert. First time there. We encountered many hills that a 650R would not make it up. The dirt was really sandy with ash in it from the recent fire. I kept sinking my front end into the sand on my 650R. I was very impressed with the stock 2006 CRF450R. One of my buds took his track bike out and stomped us on the hills. His brother, a fellow XR650R owner, rode the two bikes back to back and the 450R reigned supreme for the day up the hills. There were a couple uncorked 450X's on the ride. They were not that impressive. They wouldn't wind out like the 450R and seemed to have equivalent hill climbing power to an uncorked 650R.