Adds about $100 per door compared to a pre-hung. Handles are more expensive. But as LJ said, you have to watch how and where they are installed. This is usually ok to work around because switches can be placed on the opposite wall. The toughest room will be the bathroom. I installed one when I gutted my bathroom last year. If the room is very small, it could really compromise your layout. I got lucky and a drain just missed the pocket-door frame. Just keep in mine what ever size the door is, a bit more than that will be unusable on that wall. You can screw into the frame, but you have to use short screws and be very careful what you hang there. I wouldn't try to support a medicine cabinet on it, but small pictures/decorations would be ok.