Since using AMSOIL in my FZ1, my life has been changed for the better. A tad batter MPG, a tad smoother running, and shifting is smooth.
(That is how you would sum up your life?) 
Of course most any motorcycle specific synthetic will provide you these features.
It is a waste of money to use NON-synthetic oil.
Using Syn means your engine will last a bit longer, run a tad cooler, flow faster when cold.
(No --- it doesn't. Every engine is different --- it might help some -- it might hurt others.)
If you're changing your oil before 3,000 miles then you are wasting money.
(TRUE)
A good syn means you should be able to go 4,000 to 6,000 miles per change. The 3,000 mile rule is old school, dated, and is believed by those that have not kept up with technology; they ignore science, they ignore Used-Oil-Analysis, and go with emotion, tradition.