The best restaurants serve string beans French style, sliced end to end with the string removed. Sliced this way, the beans cook quickly, do not become waterlogged, and retain maximum flavor.
The Australians have come up with a cunning device that you simply push the beans through, and the integral blades simultaneously slice the bean and remove the string. It even automatically adjusts for different-sized beans.
It has a dishwasher-safe handle, stainless-steel blades and is 5 1/2" long overall. A very efficient tool.