I haven't seen one in person yet, but I plan to be out on the water Thursday evening and I'll take a look.
I like the attempt by Marine Patrol officials to show boaters what 150' looks like and I think it will be helpful.
The only concern that I would raise (you didn't think I wouldn't have one did you

) Is that it's another marker on the water that is unique to NH and to the best of my knowledge they don't appear on any charts yet. That may cause confusion to visitors to our lake who are used to the AToN system in the rest of the country.
By and large I think it's a good attempt! Nice to see you posting again Evenstar!