i've got a ZX2R and can confirm that they are awesome fun to ride, but a dangerous form of fun.
3 weeks into riding i had a pedentrian walk out on the road behind the truck i was following at 60km/h .. needless to say that 3-4 car lengths of time at 60 isnt enough to do anything.
ended up on the wrong side of the road with a broken and dislocated ankle.
still ride, still go up the old road, but am very wary of everything ad still get cut off by cars changing lanes EVERY time i take the bike out.
she's getting a respray now, but still wanna go riding all the time.
the biggest thing i've noticed, is that if you sit in traffic and just go with the flow, you are in more danger than if you are the one determining what you do and not others (similar to the lane splitting idea in a previous long post )