i know it's 2002 and i'm a bit slow, but my friend just bought a 2000 YZ426 and i got to ride it. the only other 4-stroke i've ridden is a XR200. i love the 426 though, so tame, but yet so fast. i think it's safe to say anyone can ride this bike. my ONLY complaint was the sub-par handling, but i could definately get over that.
no i'm not getting rid of the 2-stroke by any means, but i think it's about time for a 2nd bike in the garage ;)