I have shot helical feathers through the WB for years with no problems. I've never had a fletch come off (thousands of shots), and they have never been damaged by the bisquit. After hundreds of shots, the edges get a bit fuzzy, which makes them fly even better in my opinion. The only disadvantage is that feathers make slightly more noise when going through the bisquit with a helical. On the upside, broadhead flight is incredibly good.

Back when I still shot vanes with field tipped arrows, my helically fletched vanes also went through it with no problems. Even so, I doubt I'll ever shoot another vane again, and don't recommend them no matter what rest you use.