Did my first 50 miles on the new toy today. Wow, this thing really moves. It is actually pretty big and not a light bike, standing next to the Roadster it looks similar in size. I have to get used to the sporty rider triangle again, though it is far more comfy then the Hayabusa was.
Concerning performance, it feels really fast. I think from 2nd gear it will leave my Roadster far behind, even though it is not much stronger in terms of RWHP. (Roadster currently 163whp, H2SX around 170whp stock). It is very, very planted and solid at higher speeds, wind protection is good, but I got a nice bug collection on the helmet already.
All in all it seems to live up to the hype, and will be a great companion for my R3R.