I'm the only one that hasn't gotten one in our family, but I definitely see the benefits. If I was going to be sitting in the sun or outside for a period of time I would be putting on sunscreen anyway so I never saw the need for one more thing to put on or pack. DH, DS, and DD all have one tho. They always wear them if we're going anywhere near water. You would think based on responses, you would see them more often than not on the ship but it's been my experience that while not uncommon they're not the majority.