Too delicate if not in a completely protected place
The mechanical screw connection (plastic) is so thin that it breaks after a while. Then the seal is no longer intact. On my boat, the bilge is very low, and I frequently need to access that area. Furthermore, screwing the mounting bracket into my rigid hull was difficult (but this will likely affect other products as well). After purchasing it twice (each time lasting approximately 3 years), I've now opted for a different model.
The product is probably fine if there's absolutely no mechanical stress (impacts).