I bought one off ebay last year... not really for protection but to cover up the hiddeous wear on the front end. After 6 years and 120,000 miles on the highways, the nose of the car gets pretty well sandblasted up here in New England, even when it's not winter. All that chipping and pitting in the clearcoat looks like A$$ on a black car. Had I had the bra before all those miles, it might look a lot better. But for now the bra stays on until I finally get the LSE kit painted this winter.
If you know how to use one, you'll be OK. You will need to remove it frequently to keep desbris from under it. You shouldn't drive with it in the rain and should remove it if it gets wet. It's not meant to be left on your car for years without proper care of your car and the bra. Yeah, there may be less fade in the paint because it's protected... but I'd rather have that, than a clear coat that's shot. $90 protection or $1000 paintjob.