I have a buddy who drag races one. He has massive amounts of cash in his. He rebuikds it after every race. Nitros! Anyways, for his trail quad/everyday rider is a Honda 450R because it is reliable and handles well. He would not recommend a Banshee for any other than dirt drags. Its a headache you don't want.
Just like any machine, the right rider can be fast on it. It was made as track quad to compete with the 250R, Tecate 250-4, and the LT-R250. They never did any good. Yamaha missed a lot with these. They are extremely fast when modded but then you lose all reliability. In stock form they are reliable but they are a slow turd. They don't even hit 70 mph stock. The geometry is way off to be a track rider, everything is almost vertical on it, no good rake or anything.
i have one and i my self will tell ya to stay the hell away from one if u have deap pockets maybe mine ihavehead for 2 years and i got almost 7000 in the motor they are the shits mines on kijiji for sale now