I run 94 when I can, which is a blend between the standard 91 pump gas and 100 unleaded.
The only real advantage in my opinion, is slightly less ethanol content. Most stations will use 10% ethanol as extender basically in their 87/89/91 blends. Ethanol is not good for our injectors, mileage, etc.
I have a station near me that sells 87, 91, 94, 96, 98, 100, and 110. I never have used anything over 96, mainly because there is no reason to run anything more than 94 in our bikes.
I do it for the satisfaction I am getting more gas and less ethanol.