I use the NAP Bone collectors on most of mine.
So far they are my favorite. Extremely strong fletchings plus they put a nice twist on the arrows and has helped increase my accuracy quite a bit.
I get the ones that have a small lip on the tip of the fletchings that helps it spin.
Also with these once I get my water boiling I dip it in and as soon as all of it shrinks onto the arrow I pull it out.
I think they package says 10 seconds but it is more like 5 or 6 for me.
I have used NAP in the past. They work well, but as I talk to more people and gain more experience I have come to the conclusion that I will be fletchinv my own from now on. U may even try cresting at some point.