Last year I added a rearview bike cam for more safety. Here is my short review: Good: On overcast days or at night they work great. They have night vision. Bad: on sunny days forget it. The glare is bad. I use my side mirror on sunny days. If you get one, get the non-fisheye type lense and be sure the cable runs the length of the bike. Gives you more camera placement options. Buy a side cover for the screen. They have them for tablets. It blocks some sunlight making seeing the screen much easier.