Heavy Classic Plastic

I was wondering about those big plastic chinese boats. Traditional looking from Garden, Hardin, Huntingford, Oberly. Formosa, Hardin, Mariner, Mapleleaf come to mind.

I see a lot of these but the owner are always working on them. I have only seen one unders sail. It was a Formosa, a big one too. It was blowing about 20knts that day. I was in a T-10 trying to keep it level. The Formosa came under me. It was awesome, like a battleship. I often wondered what they sail/feel like under way. Anyone have any experience in the heavys?

thanks