I went cheap and bought the WRS. It works fine but being made in aluminum, once you tighten the set screws, indentations are made in the body and then you cannot do fine tuning because the tip of the screws bring you back to the indentation point. Later on, I read that the first thing to do with the WRS screws is to file their ends flat to prevent the indentations in the body. I should have gone with the more expensive Skinner.