The Gibbs Darter is a "classic" in the saltwater plug offerings. The darter excels in areas where a current helps work the plug, but they will work in calm water too.
Don't go to Montauk without one.
FISHERMAN TIP: This plug is more effective when cast in the current and immediately jump start with a moderate jerk of the rodtip to get the plug to bite and start its decent. Follow with a slow steady retrieve as the plug works from side to side for about ten to fifteen feet; then return your rod to a forward position pointed at the plug and allow the Darter to float back to the surface. Your line will need to be slacked to allow this but be ready as strikes often occur with an erratic left-to-right motion as it is retrieved. This is Stan Gibbs' most effective retrieve but you can experiment with different speeds and rod motions, finding another that is better suited in other circumstances.