My view on decoys is this, If you know how to use em.... you can get the same thing done using a standard sized deek than using the Mags, which depending on your budget may not be feesible.
I have seen people use full bodies on the ice to shoot ducks too... Just get what you want and think about how you use them.
I have 3 dozen duck deeks, my newest box cost me 15 dollars at Dack's and I've had ducks land in em,
I've got a 40 dollar dozen of flambeaus that ducks land in as well...