I know a bit about them. They are darned expensive. They come 6 to a pack. If you read the instructions they shrink to the shaft just like they are supposed to. But if you mess up, then what? They're heavy, too.

Damage a vane and you have to replace all three with another shrink-fletch. It's easy enough. Just use a utility knife and slice it. Then it peels right off.

Cost? I figure for the average guy to fletch 2 dozen arrows he could buy a jig and enough vanes and glue to do his own for about 10 years.And with your own jig if you mess up one vane you only need to replace that one. In my case, I've had my Bitz for 30 years. Can't keep vanes that long. They get brittle in time. Besides one company or another is always coming out with something "latest and greatest".