I shot vanes for a long time. I have no problem with them at all. I switched to feathers when I started shooting fixed blade broadheads. They stabilize much better. They also weigh less. Besides, a good arrow with barred feathers just looks killer!! And we all know, it's not how successful you are, it's how good you look doing it! [8D]
Oh, I shoot 4 inch for my practice arrows, and 5 inch for my hunting set up.