We've used them several times. Best to get the 5 or 10 mile radius kind - anything less doesn't work on a ship very well. Not too pricey - about $50-$80 for a pair.
They're also great for using in port - if they're old enough, the kids can go their way and you can go yours. Beats paying the high price of roaming charges in some of the foreign ports.
But you're right, as with most things, some people can 'overdo' being a nuisance.
Pete

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