l have them on my vmax4, i get about 10-15% better mpg as well as a better thottle responce and a small performace increase, Dial a jets are great if you run pipes as they only supply the fuel you need.
Settup is simple enough with basic DIY skills and tools, you need to drill and tap one or 2 holes per carb depending on carb type.
lve fitted dial a jets to a couple of MX bikes aswell. They are well worth it espesially if you have engine mods and ride in varing temps/altitute