I wonder what makes some WW whistle and some not? I have them on cedars and aluminums and have no whistle at all from either one. The blades are lined up with the leading edge of my feathers. Wonder if that makes a difference? The needle points on the WW are an easy fix with just a snip of pliers to make the point basically any size you want. Or, like I did on a couple while practicing. Shoot them babies into a concrete block wall. Needle point problem gone. They do resharpen back up nicely. They are a very durable BH as well as the other heads made by Magnus.