My 2 cents--skip the Pioneer cam and order the cheap Livia model from Ebay. Not only is it significantly cheaper, but instead of a little black box stuck on the back somewhere you will get a nice clean install that does not look like an add-on. The Pioneer may be better in low light, but to me that was a small concession for the stealth of the Ebay cam.
I posted some pics in another thread to show the image quality of the one I installed.
rear view camera help