I do not currently own a boat. I will be ordering one within the next 10-12 months. My choices are down to one of two boats; one a monohull, the other a catamaran. Both are in the 45-48' range. Because of a diving accident in the Carib over 20 years ago I have an inner ear disorder. I don't get seasick underway, but I do get seasick at anchor if there is more than a little roll. I don't get motion sickness on roller coasters, but I do get deathly ill on merry-go-rounds, so go figure! The catamaran salespeople have all tried to tell me that the catamaran is inherently stable, and that there is no "roll", just an "up-down" bounce that tends not to produce seasickness. The monohull people suggest fin stabilizers, but they are of no use at anchor. Flopper-stoppers are an option I suppose, although not a great one. The catamaran has a phenomenal deckplan. A master cabin that is huge and two guest cabins that would be "VIP" staterooms by almost anyones definition. SO, TO THE POINT. In speaking with a salesperson from a respected gyro-stabilization company, he warned me that catamarans DO INDEED have a "quarter yawl" type roll that is basically unstoppable (hybrid pitch/roll), including with his gyro-stabilizer. Indeed he says the US Navy is stopping production of an 80' catamaran because they cannot find a way to keep the ENTIRE CREW from getting sick. SO, CATAMARAN PEOPLE. What do you think? What are your experiences and those of your guests, both underway and while moored? I would really appreciate your help on this. I don't want to make a huge and very costly mistake.