My sole and only problem with signal mirrors above the three line is that I am pretty pessimistic about conditions being favorable for using one when I need it. With my luck, the sun will be obscured by clouds

Above the three line, using bright colors is an excellent way to stand out and be noticed.


Still, having a signal mirror is still a good idea, and there are lots of scenarios where a mirror will be helpful. I do have the AMK mirror in my "slightly-larger-PSK" that usually goes with me anywhere except the shortest/most urban trips.