Received mine today and I'm very pleased with them. Despite the additional £28 UK import duty which is not fault of TSO I may add.
First shot at connecting rails require a second go with a straight edge to get things bang on (that's with leaving a small gap between rail ends) but they are so much easier, relatively speaking (based on having used the Festool and Makita connectors), to tighten up its no big deal. A good amount of shaking the rails around did nothing to change alignment so I'm happy to trust them once set... which is a good feeling to have in any tool