IMO the ones that the crimson tallon guys are offering look much more promising than the added weight of the NAP vanes. We'll see.
This is according to them.
http://www.spintite.com/aerofoils.html
1.5” (38.11mm) Aero-Foils™ produce 10-times more rotation than 5” helicals and are 80% quieter than conventional fletchings. Aero-Foils™ glue-on just like conventional vanes and feathers and are available in 1.5” (38.11mm).
