These have been around for some time. They are not required really. I hooked up my back up camera myself, and installed an RCA Y adapter. On the backup cam thread, theres a page which explains a cheap way to hook a relay up and basically replicate what this 200$ box does for about 15$ in parts.
If these boxes were cheaper, I'd consider buying one for the ease of plug n play. but 200$ is a complete rip off.
Ya I thought it was a bit high too. The way I hooked my old one up was with a y adapter and a switch by the sunroof to throw the nav to the video input. It got old and I went back to the 12v lead coming from the reverse lights.
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