Since Subaru uses a weird design where the body of the radio is a standard double din but the faceplate is wider, a kit from Scosche is needed to fill in the gaps around the factory trim panel. The bad thing about the Scosche trim panel though is it sticks out so far it makes it hard to use the control knob.
Overall am pleased although am suffering through some of the issues that have already been discussed; iPod slow to sync, screen tends to wash out in daylight, etc.