I havent used that one but I do use the little motorized gaget that you attach to your decoy and makes it pivot up and down as if its feeding. Runs up to 20 hours on a 9v battery.
I believe Cabelas has those.[link]http://www.cabelas.com/cabelas/en/templates/product/standard-item.jhtml?[/link]

This one has a remote control and so is alot more expensive. I bought one a couple of years ago and I believe it was around $20