I would stay away from that 3M sheild stuff. I had them install it on my FX35 4 years ago and after a couple of years you will not like it at all. Even though they say it doesnt turn colors, it does, it will turn a dark transparent yellow. If it is really hot outside, the 3M tends to soften up, if you combine this soft state with a high speed bug impact, what you will get is a bug that is mixed in with the 3M (hardened state) and a nice dent in the 3M surface.
I say use the BRA when you are going to be traveling long distance and just take it off when you are not.
I say use the BRA when you are going to be traveling long distance and just take it off when you are not.