Rode my new to me 03 WR450 for the first time today. Now my main bike is a 05 YZ250f, so this is what I have to compare the WR too. I took the bike to the hardest trails I have ever ridden, trails that are nothing but rock gardens (more like boulders), roots, and mud holes. The thing that impressed me the most was the suspension, the bike was able to roll over rock gardens that my YZ would of thrown me off, actually I would not of even attempted these with the YZ. Also the fact that the bike hardly ever stalled, and when it did all I did was hit the button and I was ready to go. I also loved the down low smooth power, I was able to crawl through some tough stuff my YZ would of been stalling, and then not starting. I was not able to open the bike up to get the feel of the 450 power because the trails were to rough. What I didn't like was the weight of the bike, it felt much heavier than the YZ (which it is). I was worn out after an hour of riding this bike, in this terrain. It may be a little big for me, I'm 5 '10 about 155, I had to push and pull this bike through some mud and rocks, it really wore me out, I guess I will get used to it. All in all I loved the bike, I was able to do things that I could'nt do on the YZ, I just need to find an area that I could open this thing up to see what it really has.