I'm sure better cameras exist but I was very impressed by this cheap unit. The included hole saw was garbage, I used a die grinder to make my mounting hole. Wiring was easy, resolution is more than adequate to see what you're doing, field of view is nice and wide. Compensation for low light usage is surprisingly good.

Unless you want something super fancy and HD, this little guy will work very well.

This is the best rear view camera you can buy for the money.
At first I was sceptic all about drilling a hole in the body but once I installed the camera I was thoroughly please. The image is not super sharp but clear enough to get the job done. The specs say the image is B & W but mine is color in the day and night. Also before you install it, so yourself a favor and get a better o-ring. The one that comes with it is flimsy and this aids in the waterproofing of the camera. Mine disappeared after a week and condensation built up in the lense from the rain and cold. I put in a thicker o-ring and it all dried up when the weather got better. Now I have no problems. Plus you don't water in the body of your vehicle depending on where you install it.