Im gonna have to through my opinion in here aswell, my boy has a 700 aswell, rode it a few times and i dont think it was that fast at all, he isnt the best rider so i was abusing him all day long, when i rode it i lined up with a few different 450's and i guess it held it own, but nothing special..me and the suzuki where neck to neck most of the time, also was only able to open up 4th if that means anything..
My shee has some porting and stock carbs +4 timing, and i walk all over the piped raptor, at the same time, they are quiclker than the 660 but still nothing crazy..just my .02cents