Racer5 uses them www.racer5.ca
And there is a class for them at RACE, SOAR, and the nationals. Keep in mind that ALL brand/model specific roadracing classes are subject to disappearing at the drop of a hat when sponsorship money vanishes.
On a general track day, the issue is going to be difference in speed on straightaways if you are on track with other bikes at the same time. If the other riders on the track are competent racers and are aware of the situation and the track day organizer deals with it in an appropriate manner and it is a TIGHT racetrack (Shannonville Nelson track, Mosport RDT, Cayuga, Grand Bend), it isn't a problem. At the back straightaway at the Mosport big track, closing speeds could approach 200 km/h and I wouldn't want to be in that position.
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