In my opinion, the camera is only useful when you drive at night outside of cities and when you can not use the high beams. In that context, i think is get used to watch the screen more frequently. It depends on the road too. I don't think this device is going a safe you in all situations, but i think that my car crash could have been avoided, maybe others do not.
You can find more opinions here:
http://www.m3post.com/forums/showpos...7&postcount=16