Finally got a chance to ride both bikes. I must say the WR is a seriously fun bike full of power!! I had a 00 Wr400 and loved it, but this new WR walks all over it. Both bikes, YZ and WR (in my opinion) are exceptional. The YZ is noticeably lighter and seems to have a more "power on, power off" feel. The WR, thanks to its heaver flywheel, seems to have a smoother power transfer. You can roll it on gently if you choose. I would say the WR would be well served with a steering stabilizer if you are doing the higher speed riding, and this bike will fly!!!! One other thing that I noticed, unlike the DRZ the WR battery does not seem to effect the handling of the bike. I am still undecided which I will buy, leaning toward the YZ. In the interest of science, I am going to ride a CRF-450 this week and then decide. I have a long history with Yamaha, so it will be tough to ride red!!