RE: QuikSpins? Worth the $$$?
If "groups" are tight but impact is just 1" out, you simply adjust your sights. No vane or feather is going to correct a bad shot or realign the path of an arrow that has been shot with an incorrect sight setting.
I would like to see a test between the QuikSpins and feather fletching. In addition; if in fact the QuickSpin vanes do spin a shaft 300% more than what is common, I wonder how much penetration energy is shed off when the broadhead strikes the game. I would also suspect that there has to be a (flight) noise increase.
However, it is your money.