Tom - We have had our 21EC on the Bay numerous times. Over this past 4th of July, the wind was gusting up the Choptank, blowing 4 footers at the confluence of the Choptank and Tred Avon. This was our first 'real' run in our boat, and we were amazed at how we just bobbed over the swells. My previous boat was a 36' GB classic, and we would have had the bow pulpit in the waves on that afternoon.
Taking a beam sea is a bit more of a challenge in this little tug. You have to pay attention.
Slow is the other operand. We have always had trawlers, and we enjoy the the pace. If you need to go beyond 8 knots, this is not a boat for you.
Finally, with a trailer, our 21EC has been from Virginia to Lake Ontario in our first season of ownership. This winter we plan to take her to Marco Island for a week, and then in the spring to Charleston and Hilton Head. It is a great trailerable and comfortable boat. WJC