The Zipbaits SSM85 has a S-shaped meandering action that synchronises with the flow in slow retrieve. It invades itself into the twist and invites the target waiting for food. When you add jerking or twitching, it responds linearly and darts left and right. Along with making the timing of feeding, turn on the feeding switch for fish that have become less active. The standard model is for surface range capture.
The heavyweight MDS model is great for long throws, medium and deep water capture, and drift methods in rivers.