I got to have a ride of the CBR1000 too (ie. I rode the 600RR then swapped with him at the halfway mark).
My first impression when on the bike was that the riding position was very similar to the 600RR, but it was a little "deeper" in and around the seat, probably due to the larger tank. Very comfy.
From my point of view, it was very easy to ride. Handled nicely, lovely power. Not as overwhelming as the SP1 when I first rode that.
Having said that, it's probably nitpicking when I say it was a little too easy to jump on and ride. I'm a chick, and don't ride 1000cc bikes very often, but this was just too easy. Like Jarrid said, it doesn't really grab you with a personality. Overall I'd still go for the 600RR. It loves to duck and weave, has awesome brakes, and screams like a banshee on the track. Not that I'm biased or anything
Definitely recommend going for a test ride. And if you do take the plunge and buy one, for heaven's sake don't get the tri-colour! Fugly. In fact, looks-wise I'm not a big fan.