Reversing camera?

It's getting close to delivery time now, and already time to start thinking about upgrades. While the Mountune stuff is appealing (and might happen eventually) my ST is probably not going to spend tons of time on the track.

I was looking into adding a reversing camera - does anyone have any experience or opinions of the NavTV module, which apparently would allow the stock MyFord Touch screen to display a camera...

http://www.navtv.com/product/207/myfordtouch-cam.html

Thoughts? $500 seems like a lot.