I originally bought the top screen, because in japan the Honda nsx has the top screen for navigation. It has a dvd-rom player and everything, BUT alpine wanted nearly $400 for an upgraded dvd and i got the F90BT for $545 shipped. I thought with the a/v outputs on the head unit that i could move the nav to the top screen. Just seemed stupid to pay $400 for a damn dvd-rom on an old system. I like the f90bt especially after i updated it last week, but to route the other outputs to the top screen.