Very good workmanship. The mechanism is very good and not fragile.
Almost compatible with Ikea rails. Male side: no pb connection (even if there is a ball to the Brio switches). Female side: one can connect small Ikea rails by forcing a little (then the traces are aligned so no worries déraillaige the train). For cons, I had more trouble with large Ikea rails: the rails were not in front between Ikea and Brio referrals. Tip: have to be installed on rails Brio Brio switches.
