The fly screen. I have placed one on my Bonnie-A...........the fly screen serves multiple purposes and has justified its premium price..#1 it looks stylish #2 it meets our state requirement for a windshield if I am ever careless enough to forget eye protection #3 it is an instant conversation starter i.e. "what is that supposed to be?" #4 it keeps the bugs off the back of my speedometer and #5 it creates a bubble of protection around the rider at 160mph..note: this last example is used around sport bikers and always brings about a sense of awe from these types.....bottom line- it is worth it !