I think the plug mods are a cheap way to get a little bit of light. Some of the more expensive plug lights, like the diablo, are almost as much as the permanent mount lights. And the permanent mounts, like Abyss, shadow caster, oceans, while expensive, can be found pretty reasonable when you consider the competition selling vastly inferior products that will only fail. The issue I have with the Diablo Royal product, is that it is big and while it is a good illuminator, it is hanging off the boat and just subject to causing a bad failure IMO. And again, if your going to spend that much money, why not get a good light that is installed in a way that protects not only it but you, your kids, and your boat. We just lost a member as he passed, RIP MikeyL...he was a supporter of the Diablo Royal. I think what he liked most about it was that it was a quality LED chip, a CREE fixture. But the housing and how it is mounted is just as important IMO. Your mileage may vary. A bunch of the issue is the mounting surface. Some guys don't want to take the time to mount it correctly. You simply must fashion a King Starboard bezel if the surface is not flat. But making a bezel isn't as hard as it sounds and some companies can get you started with one to mate to the light, and then you can get the curve correct on the starboard by fixing some sand paper to the transom and just working the bezel back and forth across the paper. That will gradually fit the bezel to the curve. Then just remove the paper and set the bezel and light. Anyway, hope this helps and you may have a flat surface back there anyway!