I can't for the life of me figure out why you would turn your head away from your mirrors which when used properly are displaying two different angles giving you a complete view of the side of your rig... To look at a 6 inch video screen which displays only one of those two angles. At least on the passenger side it might simply be part of your "visual sweep" as you move from eyes forward, to the mirrors and back again... But to use the camera on the driver side your are moving your eyes about 90 degrees away from where you should be looking.
The side mirrors to me are one of those Tech cases where just because you can do something doesn't mean you should!!!
The rearview is a different story. Tech here is clearly an advantage. How many times have you been preparing to make a lane change and some twit in a Miata comes screaming up directly behind you and moves at the last second into the lane you were just about to merge with. If your camera is running, you see that twit coming and can hold off on the lane change. Without it you are left with the quick jerk back into your original lane to avoid the colllison he almost caused.
Just sitting here typing has me even more convinced to disconnect the side cameras... Guess I know what the next "Mod" is
On a Tech side note - I discovered today... Even thought the Jessen has a Bluetooth option that connects with my phone and dowloads my contacts... There is not an microphone inside the cabin... I can hear the voice of a person calling but they cannot hear me... So much for hands free calling.