The Halcyon lid is completely sealed, preventing any water from passing through the lid. This is only possible on designs without open wires penetrating the lid. O-rings must seal any exterior fittings such as with the Halcyon design.
The competition claims to sell a "dry lid which is completely sealed providing protection from water intrusion due to a cut cord or switch boot". Even the casual observer will note that water will migrate along the wires. At best this slows water within the semi-dry lid.