While I have yet to purchase a motorized decoy will share my opinion.

Keep your decoys clean and painted. I find decoying ducks has more to do with your decoy layout more than sleepers and the rest. Motion is important and I do make a few jerk decoys at times.

But adjusting my overall spread from a few decoys to maybe a few dozen and then using the wind to make those wary flights feel more comfortable with my spread.

I know a guy across the lake that has a wide variety of different species. He uses quite a variety.
I do just as well with just using my Mallards, then adding a few divers to later in the season less Mallards to more divers.

That is what I seriously watch.

JW