I have used mojos, ect. for several years now, but have quit using them the past few season......first off, because they are a bit of a PIA to haul, set up, ect. The second is that everyone and his brother has 2, 3 or a dozen mojos set up.....I feel that the birds are used to (and wise to) them, esp. late in the season.
For movement, I've tried all the duck torpedos, ect. ect....they get tangled, or the props foul, ect.
I think a duck butt rigged with a jerk cord is ideal, and I have a couple of quiver butts that I put out if the water is absolutely still and there needs to be some movement.