Petitjean Streamer Heads

So I bought some of these things to try out.  Although a purist would scoff at the idea they seem like a crazy innovation in streamer fishing, just wondering if anyone has any feedback/experience/comments about these little gadgets.  They can be flipped both ways, with the cup out it wiggles.  if you go to the website they have videos on how they work, pretty cool if you ask me. 

i have them haven't used em as of yet let me know too

We used some on some polar fiber flies for snook on a trip last year, and they were great! Pain in the butt to pick up out of the water and throw when the head was facing forward. We ended up trimming the bottom lip a bit, gave a better swim. Didn't like them facing backward. Tight lines!
Steve B