As far as I've been able to tell (please someone, correct me here if I'm wrong!), every retracting in-dash monitor that has been tried out on the forums has been a failure for some reason or other... usually because they're simply poor quality.
I ran across
these two earlier while looking into purchasing one of
these monitors, recommended in
this thread, to mount flush in my dash. As far as I can remember, there was a rather extensive review of at least one of those units a while back that said while they had a lot of features (built-in DVD drive acted as DVD-ROM!!), the amps sucked, and the screens broke all the time.
I'm just going to bite the bullet myself and try to pop my fabrication cherry without destroying my car in the process... :-P