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Anyone have experience with one?
The Walker Bros one is a functional copy of the original Sub11/Surly Fixxer. I've used a Surly Fixxer on my race bike for over a decade, and another on some equally old but less used spare wheels. It works, but only with specific hubs. That means quite a few legacy Shimano models, but nothing current that you wouldn't be better off just replacing with either a proper track hub or a converted 6-bolt disc front hub.
Tester once mentioned Walker Brothers for a shimano fixed adapter. Anyone have experience with one?
https://www.walker-brothers.co.uk/product/free-hub-adapter-shimano-cassette-hub/