Many years ago I brought a Silhouette bilge keeler round from Chichester to the Broads, remarkably seaworthy and she handled well enough, albeit slowly. Couldn't swivel her round like a c/b dinghy, either at sea nor on the Broads, but that was no real problem when tacking at sea where once an hour is quite a lot! Where I did find the Silhouette lacking , and various other 'sea' boats, and my Drascombe, was that none of them held the bank at the end of a tack like a Broads keel boat can. A good friend of mine had a Lysander and he loved it, that was about thirty years ago. He didn't ever race it that I know of but we did have some excellent pub crawls even if he did miss the first couple of rounds!!