Field Assessment
The Sea Sparrow solves the problem the Leonida Keys creates: how to move between the outer islands when there is no runway and no road. The float equipment allows water landings at any calm water surface, which in the Keys means the aircraft can reach locations the road network and the standard helicopter cannot serve.
The Keys geography makes the Sea Sparrow specifically relevant. The outer islands have beaches and docks. Neither requires a runway. The Sea Sparrow lands at both. The operational range of the Keys becomes the operational range of whoever is flying it.
The floats reduce performance relative to the standard skid helicopter configuration. The weight and drag of the pontoons are the cost of the water landing capability. For Keys operations this is the correct trade.