I had seriously considered buying one but for a large part of the year we are glad to get a couple of mtrs vis. It'll be like driving in really thick fog ........ do you get fog?
2 weeks ago my mate went for a boat dive off Dover and at 14 mtrs it was pitch black and he could only see a couple of inches. Fortunately, when we do get a good summer the vis can be awesome and is all the more appreciated because of all the bad days.