The LCD screen is nice to have. However, I am looking at getting a bigger one. Additionally the one I have is not as good with off-axis viewing. It does work great for backseat passengers. (I have two young children, hence the DVD and screen, keeps 'em occupied on long trips.)

It does get in the way of the rear view mirror. This does not bother me, but there are options. You can get rear view cameras that hook into your video system to display what is behind you on the monitor. I am planning on also getting monitors for the back of the head rests so that I do not have to have the front one down all the time.

The cost was relatively low for me, as I am the co-owner of a small (emphasis small) car audio business. Has saved me a whole lot of money on the equipment I have. Still not cheap, but alot better.