For what it’s worth, I recently got back from a trip that was planned with only about 40-days advance notice (and so could not benefit from leading reservations, for example).
I used all three reservation finders: TP’s Res Finder (free/2 searches), Mouse Dining (free/6 searches) and Mousekepros (paid/50 searches).
Had pretty good success with Mousekepros. Had no problems getting what we wanted: Topolino’s, Hollywood Brown Derby, Oga’s, Sanaa, Candlelight Processional, etc.