Just my experience, but I learned to ride (after the MSF course) on an 883 Harley Hugger with buckhorn handle bars and forward controls...I moved from that straight to the Busa and didn't have a minute of trouble. I actually found the Busa a whole lot easier to handle and sometimes wonder how I ever learned on that Harley!but what about when they transfer over to a new bike then they have to learn a whole new position. I nvr made the tranisition myself but from what i here going from cruser to sport bike is a big difference as far as turning goes
I don't think transition from one position to another is as difficult as it appears. I didn't have problems, my husband routinely rides my Busa and his Harley...shouldn't be a huge issue...