I used the Wigglefin's a bit this past summer while flyfishing off the beaches for coho.
Seems like a decent product and it does add motion to the fly.
They worked best with an unweighted fly. Not much fun to cast when using a clouser or other weighted patterns.
I recently order a very similar product.
http://www.brineflyinnovations.com/I found these much easier to cast and I like the different size options. I plan to put these to a lot this summer. I've read some glowing reports on these from striper fisherman so we'll see this how the coho like them this summer. Based on last weekends outing I really like the way they move a pattern.
SF