I own a 11.A S2 and have sailed her offshore quite a bit. 2006 2007 Cruise
Here is a link to a log of our most recent trip from Texas to the Bahamas and back. We just returned in April so I haven't completed the web log yet. We went across the Gulf directly to Florida and back. Took 7 days nonstop offshore each way so we saw quite a bit of Blue Water sailing. Also crossed the Gulf stream twice from Marathon to Bimini, 130 nautical miles. Then Gun Cay to Miami. The Gulf of Mexico has notoriously bad weather associated with frontal passages. We saw several hours of 40 knot winds on the way over and an hour of 45-50 knot winds with 15ft breaking seas on the way back. The boat handled these conditions fine. You do have to use some sense and reduce sail early in those conditions.
Sailing upwind in rough seas the boat pounds some due to the flat entry forward. This is a bit uncomfortable but not dangerous. The hull to deck joint is thrubolted every 4-6 inches and very stout.
The interior is built in wood glassed into the hull. This is superior to Pearsons, Catalinas, and most other production boats.
The standing rigging and chain plates are heavier than those on most comparable Blue Water boats.
I do carry emergency storm shutters in case one of the large lexan windows fail.
The bilge sump is about 4 feet deep so no problem with water sloshing around out of reach of the pump. The boat had no opening in the sole over the sump so I cut one. Had to clean everything that had collected there over 20 years.
I would not take my S2 around the world but have no problem with going anywhere in the Caribbean.