How accurate is connecting two 55" tracks versus one 109" ?

Hello, I saw your post on the Festool fan page where you received some good advice and answers. You can get accurate results when joining rails together, but it's recommended that you check the rails with a quality straight edge after they are joined. We recommend leaving a small (1/32") gap between the two rails for the best results. We do offer the Betterley rail connector which does offer advantages over the Festool rail connectors. Ultimately, the best results and quickest way to make long cuts is with the longer 106" guide rail.