Okay, I admit it, I've got one on my FJR as of the day before this thread.
Little story, I was given one a few years ago, had it on my custom Honda. Never a problem. Then I bought my Mean Streak, so I transferred it over, the very next day, my Honda chaffed the wiring through the handlebars. Flash forward about a year, the Mean Streak needed new tires, the Streak has a small chin spoiler on it, to which, the bell was attached. Knowing the lugens who were gonna swap my tires would jack up my bike, and thus, breaking my chin spoiler, I took it off - along with the bell.
So I'm riding the Streak home and marvelling at its new found road manners, a gravel truck goes by, showering the road with gravel. Wouldn't you know it, the biggest nastiest piece of rock that came off the truck started bouncing right at me in slow motion. I heard it hit, thinking I was about to witness my windshield disintergrate. Nope, when I got home I started hunting for the hit point. Turns out it was on the backside of the mirror - a pretty good size dent in it. The bell went back on that afternoon.
No problems for a year after that.
I buy the FJR. No gremlin bell. I'm riding down the hwy through a construction zone, yet another gravel truck (actually, a slag truck - think bigger, kiln melted rocks) goes by around a corner, once again, spilling part of its load directly in front of me. BIG HIT. My brand new Cal-Sci windshield took a direct hit in the bottom clutch side area. BIG gouge out of it, but intact.
So, when I got home, the bell came off the Streak and got put on the FJR.
The stupidest bit though is people look at your bike, could be a tricked out custom painted chop, or FJR, and the first damn thing they ask about is the bell.