BlondezZilla's first post is awfully trollish... and doesn't seem to have any real relevance to the OP.
Just because a boat doesn't cost $xxx,000, doesn't mean that it isn't necessarily an unseaworthy boat. The Iroquois catamarans were built in England, and most of the ones in the US, came here by sailing across a little body of water called the Atlantic. As such, if they've been well maintained and are in good condition, there's little doubt that they would be able to make such a journey with a little preparation.
Just remember, any idiot can capsize a multihull.
Good multihull seamanship means sailing the boat properly, to minimize risk of capsize or pitchpoling. Most multihull capsizes are the result of one of two things, if not both. The first is being over-canvassed. The second is going too fast for conditions.
Multihulls should be reefed to match the gust wind speeds, since they don't have the ability to bleed off the excess energy of the gusts by heeling over like a monohull. This often means reefing a bit earlier than some monohulls. However, most multihulls will still sail far faster, even reefed, than their monohull counterparts, which are mostly limited to their hull speed.
Most multihulls will sail far more comfortably when sailed at speeds to suit the sea and wind conditions—just cause you can do 14 knots doesn't mean you should be doing 14 knots... slowing the boat down to 9 or 10 knots will smooth out the ride and make it much more comfortable, while still leaving most monohulls in the dust.
Often, these two problems compound each other... leading to either wind and wave induced capsize or pitchpoling. The solution to the first is often the solution to the second—reefing properly to suit conditions. In extreme conditions, most multihulls would be wise to deploy a series drogue.