all have mixed reviews defendant on who is conducting the "investigation". I fly the standard Davis reflector from a flag halyard and have had excellent reports of my visibility from all I have asked. I rig it at the beginning of any extended cruise and it comes down afterward. I also have a Davis inflatable emergency reflector which I am told puts out a larger return--but I have have flown it, yet. This on a 40 foot fiberglass sailboat.