I have a friend that sells a ton of them from his shop. They are cool for about 15 minutes, then they are a pain in the ass to maintain and find a place to ride. They can get going pretty good though, we clocked one of his with an aftermarket pipe at 60 kmh. Freeing up 2 hp does amazing things to something so light. He is now bringing in some mini choppers that can be registered for the street. It is basically classified the same as a scooter, but has to be registered similar to a custom chopper, which can be a pain.