I've got ICS Hunters done with 4" factory vanes, feathers I fletched, and Blazers I fletched.
One is as accurate as the other, but the blazers are far tougher, and I think they fly quieter than the 4" vanes. I KNOW they are much quieter than feathers. When my buddy shoots indoor 3-D you can hear his feathers for the entire flight of his arrows. I never hear my blazers.