Has anybody used the quick spin fletches and if so what do you think?

Yes. And I'm my opinion do they work? not as advertised. If your bow is out of tune they will shrink groups, but if your bow is in tune you will see no difference. They are not very durable either. I will stick with my feathers.

I have to agree with ewolf. I also found them to be very heavy and mess up the foc pretty bad. One passthru and they are junk. Save the money and use feathers.

I use them, but no big significant change on a well tuned bow. Because of their weight it falls off/drops, pretty quickly, especially when the poundage on the bow is low.
They also make quite a 'fluttering' sound, however @ 20 yards, sound doesn't really matter.
I'm waiting to try the smaller sizes NAP has launched at the 05' ATA show.