I assembled two Fast Tracks Bullfrog Switch Controls and am very pleased with the results. The instructions are very clear and the tolerances of these little devices are very precise, even with my substandard assembly work!
They operate very smoothly due to a spring-loaded ball bearing that holds the switch in position. It is controled by a rod mechanism that is mounted into the layout facia.
If you are looking for a manual turnout control, I can highly recommend these. At $6 per control, you cannot go wrong.