I think it's the best thing since pockets on shirts. The only problem I ever had was they would slip up and down the shaft after a while, but a couple drops of fletchtite on each end of the sleeve and the rpoblem was solved.
I have been using shrink fletch for two years I only shoot a whisker biscuit. If you prep the arrow right they are flawless. If you do it in a hurry, after time they will slide back a little, or pop off completly. I have been fletching my own arrows for about 8 years and I will not use anything but shrink fletch again. Even the helical twist is almost perfect. I bought a entire case, I probably should have waited cause NAP makes em now.