What about some of the motion devices that merely create ripples in the surface of the water, giving the illusion of motion to your decoy spread on still days? The mojo can be useful sometimes, but I've got to think that ducks get wise to the mojo, particularly on bright, clear days. I think on bright clear days -- motionless water -- you might be ahead with the substantially less expensive ripple creating device. Having said this, I do not yet own one of these ripple devices. This makes me mindful to go buy one or two.