I bet you could put a hatchet on the end and shoot it straight!!
Being that the QuikSpins are basically a vane with some type of innovative design added to the vane that simply causes an arrow to spin more, I would agree that the design is not so radical as not to work as well as most conventional feathers and vanes do when the rest of the setup is correct.
The question is do the vanes produce flight-performance, grouping, and accuracy to such a greater degree than other vanes as to justify the cost? In bowhunting, 1" off mark is not a whole lot to fret about. How tight are the groups when 1" off mark?
Is the material more durable than other plastic vanes? If not, than what happens to the aerodynamic features of the vane once the vane is cut, wrinkled, and/warped; which can easily happen when shafts bury deep in a target.
Considering that there has to be some increase in drag factor from the increased rotation, would not there be speed loss, even minimal?