The Z1000 felt like a 600cc frame with a 1000cc motor stuffed into it. I liked it the only time I road one. The only thing I didn't care for with the vibration/buzz, but like my 919 doesn't buzz. lol I did hate the tach, though. Can't read it in the sunlight.
I would seriously entertain buying one, though. I believe you'll enjoy it a lot and have a great time on it.