As you might remember, I had an NC Expedition built for me in December of last year. I have now had it out in a variety of conditions, most significantly, yesterday the wind was really kicking up some very interesting waves. The only thing I can tell you is that I was very happy to be in the Expedition. It made the waves seem smaller than they realy were and I shouldn't admit it, but I didn't even have my skirt on. Not one drop of water even came close to getting into the cockpit and at no time did I feel like the boat was out of control. There was a moment though, when the waves and very strong current caused me to broach a little, but even then the boat was totally stable--even with whitecapped breakers on my beam.
If I were thinking about open water kayaking, there is no other boat that I would put higher on my list than the NC Expedition Lt. By the way, NC has their Spring time sale going; $800 off the regular price.