As I have mentioned before, I had helped a fellow who was building one in the 1970''s. His had concrete and steel ballast. It was poured into the keel stub and was lightly glassed over. He also used conventional exterior plywood throughout the boat and skip tabbed bulkheads in with thickened polyester resins.
Yes I have sailed on them and have also seen gobs of them underway in a wide range of conditions. I have never seen one doing anything approaching 7 knots.
I don''t believe I ever said they were worthless, just useless as sailboats in light winds. I too agree that a lot of folks really love thier Westsail 32''s. While you are right that many have gone around the world, there has also been a lot of really junky boats that have sailed around the world as well.
As I started out my post, these are controversial boats. They obviously have thier fans and thier detractors. I am glad that you like yours. Every pot has its lid.
Here is some actual real world information about the light air performance
of the W-32. These pictures were taken in Puget sound last month. The pictures show the sail configuration and the apparent wind conditions, as well as the speed of the boat through the water.