Having had back-up cameras on several vehicles including my current M45, I can say that they are really nice to have but seems like a bit of overkill for the 370.
And, considering some of the posts I've read on some sites about the lack of substantial weight savings in the 370 compared to the 350, it seems a bit ironic that folks want to do things that add yet more weight (even if it's a small amount)!
