I don't get how someone can consider a 600cc crotch rocket "slow" or "underpowered". Are they not as fast in a straight line as a liter bike, no, are they faster than 99.7% of the boring, transportation boxes people get around in, absofreakinglutely. I've never ridden one but watching the speed they can gather when they pass a line of cars on a dual lane highway, slow they are not.