I wanted to like the MT09, but when I tested one I wasn't so keen. It felt like my hands were too close to me, which I didn't like, some people will be fine with it.
I also found the engine a bit coarse and not as powerful low down as I was expecting. It is very light compared to a Fazer 1000 and the handling/ride were better than you read about and I am a fat twat.
It would be great going from a 600 I would imagine, but not for me.
Good luck with what ever you choose.