I kept mine on most of the time. While watching the shows it was worse, so I'd press down on them a little harder and it helped. The anestesiologist (sp) also did the pressure thing on my wrists after my c/s since I also get sick with any surgery. Really seemed to help then too.
One night the seas were quite rough and the ship was rocking pretty hard. I kept up with the Sea Bands and meclinzine and I was fine, while others not so much. They aren't the most fashionable things to wear, but I'd rather where those than be sick. Even if you don't wear them, you can still press on the pressure points yourself to help relieve the nausea.