Oops, forgot to tell my experience with it. :-)
When my hubby taught me how to ride, he actually started by teaching me to upshift without using the clutch, but by briefly letting off the throttle a bit and shifting up nearly simultaneously. Until my MSF class about 2 months later, I never used the clutch except to downshift, however, when I learned the clutch, I liked it better. I began to predominately use the clutch when upshifting because I hit fewer false neutrals. Now I use clutchless when accelerating quickly, such as to pass a car or two, but I'm mostly a clutch girl. I've never had enough mettle to try clutchless downshifting.
