I got my 90bt installed and after two days I can say that I really enjoy it. I have a F-150 Screw and it was easy to install. Did the software mod for dvd playback according to directions in the forums and it worked perfectly.
The voice control works better than I thought it would, especially when trying to select a particular artist.
I hooked up the ipod connector via the glovebox to my iPhone, and it works perfectly. The bluetooth connection with the phone works like it should.
I mounted the GPS antenna inside towards the front of the dash and I have not seen any drop in cover