I had a 2006 for a year. I really liked it, it just worked with me
It's crazy fast like all the other liter bikes out there, but I think it was a bit more friendly too. The bike was reliable and never had a serious issue. I found it pretty comfortable but I DID buy a Corbin seat, Helibars, and Vortex rearsets (installed on the opposite sides - you can lower the footpegs about an inch!) I still have all those parts too..... for sale cheap
Here are the quirks that I noticed:
Kind of hard to read the instruments due to a tinted instrument face.
Minor fairing buzz up front (but can be fixed with a little hidden electrical tape)
Slightly mushy feeling to the front brakes
Other than that, I loved it. The only real reason to sell was to pay down my wifes car and I wasn't riding it much, I have a ZX14 that got more attention.
I know this isn't a "review" but if you have questions feel free to ask. Overall I would be quite happy to own another one if I still wanted a liter bike.