I haven't had any issues with the O-100's. I have one O-42 GG switch and I had one issue with it. The guard rail on the divergent track was too far away from the rail and isn't really placed well to make it effective. I had issues with wheels riding up and derailing on the frog until I fabricated and installed and new guard rail. I bought it several years ago, so GG's may have improved them since I bought mine.
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