I had one like that but older. Those run very, very well and I never had any engine problems. The horsepower may not, in reality be much more than a CR...it's probably a matter of how they measure/rate them...either way it's very fast.
As far as expensive parts, the only issue I had was the clutch. It started slipping and I was shocked to find out the clutch pack was $350+, keep in mind this was many years ago so with inflation it would be much more in today's dollars. I deglazed everything, shimmed the springs...the clutch stopped slipping and I didn't have any more problems. The fact that I had the bike geared to go 90 mph+ and it was only a four speed was not helping matters any.
These are bikes that have the kind of power to, if you want, go from zero to some rediculous speed in one gear, if you are willing to slip the clutch a bit on takeoff.
Mine would light the rear tire up on dry pavement at will.
Have fun!