Spring tension and chain line adjustments are easily done and the floating pulley keeps the chainline perfect. The Singleator accommodates both 1/8in and 3/32in chains with an 11T pulley. Chain guides either side of the pulley stop the chain from dropping off which it never did in nine months of riding. The spring is triple-sealed and the pulley can easily be stripped apart and serviced, I did that but mine didn’t need so much as a greasing. The amount of spring tension is just right to stop the chain slapping and keep it tight. Whether pedalling quickly, slowly or whilst going over rough sections it was never anything but smooth and silent.
For £34.99 it’s getting close to the price of some pretty good derailleurs but I think it’s well worth it. Performance, reliability and looks are all excellent!