Unfortunately they didn’t let me test drive them but I sat on each one . I’m 6’1” 190 lbs . The ZX6R and RS660 have a similar riding position. Not as extreme as the Yamaha R6 or the Ducati v2. Legs were comfortable - no more cramped than my N650. Grips about 3” lower and more forward . The Ducati SS 950 was somewhere in between the N650 and ZX6R in terms of bar reach /drop. Overall the Ducati was the most comfortable transition. Seats all felt the same to me . If I was riding 200 miles , I would take the Ducati, but the other two were not horrible but would require some training to get used to . Very hard to decide which one without riding . I’m sort of partial to the Kawasaki brand . The 4 on the 636 sounds like a formula 1 engine - but not sure I would want it as my only bike (?) . The Aprilia is a new platform. It will take a while to get the bugs out . Not sure about the multicolor scheme - not my thing . The Ducati is beautiful. I just wonder about the security of it in a public lot on campus ( I would occasionally commute with it ) . Decisions , decisions..