I don't have one but a couple of friends use them. They do a good job at keeping rock dings off the fairing. However, just like bras on autos, if left on too long when wet, the paint will discolor. If I remember right, the insts that comes with the bra suggests you remove when wet. I wouldn't use one for that reason. Just my opinion.
For what it's worth, here is my opinion on them bras, why not just bra the whole dam bike then, who needs any paint showing, he.ll, don't stop on the paint, keep going on the chrome also I just don't and will never see the point in one but who am I any way, I will be a guy with no bra
My road glide with 45,000 miles, the fairing looks it. Maybee a bra might not have been a bad idea. I wouldn't care but It's the screaming eagle and not as easy to repair as black or a single color. I'm not getting one but the chips bug me, what the hell, I ride it.
The warning about taking it off when wet would be a real pain. Didn't have a fairing bra but HAD a tank bra due to my jean's inseam was rubbing and scratching the $hit out of the rear sides of my tank. Easy to put on and easy to take off BUT......the bra ended up scratching the tank even more than my jeans (the bra's seams are not lined in felt). So I threw my bra into the fire and now show my tank free and bare.
Unfortunitly....if you ride them, they get dirty, scratched, dented, dinged, rubbed, faded and so on.
I have the Ultra with the bra. I used it the first winter I had the bike just to keep salt and sand off the front. I haven't felt the need to put it on yet this year but it's like Markcuda said, after a while you wonder why you're putting the thing on in the first place.