The motion on a catamaran can feel a bit more herky-jerky in a seaway because they aren't displacement hulls. You're riding more on top of the water. However, you aren't transiting at 15-20 degrees of heel either, and you can do things inside the boat (make lunch, play cards, etc) while underway that I would never consider doing in a monohull. The only time I really get quesy on a boat is when I stay below too long in a monohull. If you have non-sailors in your group, they will probably enjoy the cat better. Can't beat the space, especially at anchor. They also don't rock at anchor like monohulls do. Don't get me wrong, I love monohulls. Have owned and raced many. When it comes time to go cruisin' however, it will be on a cat, most definitely!!

Rob