Looked at this before I bought my R3R, very clean and presentable in the photos but when I contacted them they were not prepared to allow a test ride or even start it in the showroom if I turned up, (wasn't being sold by these guys at the time).
I only walked away because it will have the same problems as all early R3's e.g. ignition switch/headlight etc. but multiply that with clutch and transmission issues and for once my head ruled my heart.
Regarding the clutch, TTS (whom I presume have done the conversion) offered a clutch upgrade as part of their installation so if that was taken it might not be an issue.
Still, hell of a beast!