Lot's of pilots have back up things like radios,GPS's and fuel pumps. My opinion is if it makes you feel better, do it. For me personally, I don't do aerobatics and I have confidence that my plane is solid, I'd rather take my chance of making a controlled landing into the place of my choice. I know some will say we don't always have those choices. Any thing can happen but you can't possibly be prepared for every possible situation. I believe in taking reasonable precaution but if I wanted to play it completely safe I'd stay on the ground. With my luck I'll probably end up run over by a dump truck. Also I have to consider the cost and weigh the possible benifits. So my answer is "NO" I don't have a BRS. I should have just said that to start with, Right?