The C&C Family.
Have a C&C27 Mk2. Like other balsa cored decked boats, water penetration can cause problems. Would suggest that they are no better or worse than most other cored decked boats. I have just repaired two minor wet core areas on my boat totalling 1.5 sq.ft. I think that speaks pretty well for a boat built in 1973.The 27''s are superb boats, particularly the MK2 as they are really good sailing coastal cruisers.