I haven't tried them, but here are some of thecomments I've seen tossed out by those that have on the other boards:

If the water is too warm you get wrinkled vanes.

Only offered in straight fletch w/ 4inch vanes.

Sometimes they slip up and down the shaft. Come loose after a few shots.

Too expensive.

Weigh more than just vanes and glue.

Very fast application.