I like the BT11 because the monitor is off the dashboard and up on the rear view mirror where I naturally look to see what is going on behind me. However, I still rely heavily on my mirrors, this is just another tool to use. When I'm passing someone, I know that as soon as I see them in the display that I am far enough ahead of them to safely move over, but I still check the mirrors to make sure no one else is there. People drive crazy these days and its not uncommon to have someone weaving though traffic passing people on the right and left. The red indicator helps with that too. If I look up and see red I know someone is passing me and is probably in my blind spot. This feature works most of the time. It also records what going on a head of you and behind you. I forget how large a memory card that I put in it, but it records for days before it starts overwriting the videos. You can also save the video's by hitting a button on the display and it will automatically save the current video if it senses that you have come an abrupt stop (like during an accident), but I haven't needed of tested that feature.
In short, I like the BT11, but its not going to replace using your mirrors, no camera should. Best of luck.
