Okay, so apparently I misunderstood... the rear camera they're putting in is OEM, so it is seamlessly integrated into the car and operates like it says in the B-Class ED Owner's Manual. For some reason they need a third party installer to do the work, which is where my confusion arose from. Anyway, it's installed an ready to go, so I'm picking up my B-Class ED up in a couple of hours. Woohoo!!!
Thanks again JeffRay and everyone for the info/advice!
Thanks again JeffRay and everyone for the info/advice!