I'm skeptical it would work well even if it works at first. I've seen birds get used to things similar to this.
I agree Cecil...of course for $50 it might be worth a try.
BTW...found them offered at several places for different prices.
Also found this video about them:
http://www.youtube.com/watch?v=vgW4KWe2WMI And found this full size decoy:
Full Size Gator Decoy The gator decoys would almost be worth it for the prank factor.
People would freak! Ha Ha!