HP4 
HP4 is a great bike, but the RR never gelled with me. It was soulless compared with the Aprilia. Besides that, it wasn't built well. The engine had to be removed because of a factory recall within the first 6 months. The kickstand was recalled, the seams never fit well, etc. The guy who bought it from me said the radiator blew a hole... all this at under 6000 street miles... no track.