One word: different. At sea, a monohull's roll, heel, and yaw are familiar-not enjoyable, just familiar. A cruising cat serves up an alternative palette of motions: up, down, sideways, forward, aft. In almost all conditions, a cat's moves are quick, but they're small in amplitude. In real terms, this means that the rowdy sea conditions that send books and bodies flying on a monohull probably won't spill your coffee on a cat. Sailing upwind in windy, choppy stuff, a cat's motion is a kind of quick thrusting coupled with occasional sessions of hobbyhorsing-not something you want to do all day, unless you have to. But thanks to hull sections that are gently rounded, a cat doesn't pound. As far as heel, you'll get 4 degrees: In 12 knots, in 20 knots, in 30 knots of wind, you'll heel 4 degrees. This is something that's very easy to get used to. Downwind, life is good: A cat absolutely doesn't roll, and the two widely separated, relatively narrow hulls minimize yawing; unlike the corkscrewing of single-hulled boats, cats exhibit superior directional stability. Monohull sailors are inevitably disappointed with a cruising cat's lack of "feel" on the helm, but two hulls do make the autopilot's job a lot easier.