Like the brass model, this wider version of the P.E.T.E. gadget does train the tiny, very specific muscles that are vital for your reed embouchure. Stick with it, eventually you'll notice the change. It also helps beginners to locate where the physical work has to happen. I much prefer the metal version to the plastic one, for hygiene reasons. The only downside is the steep price, but then again, innovation should be rewarded ...