I had always wanted a double trigger Superposed, so when someone here had one for sale, I bought it. It was nearly new. I found that I didn't like the ergonomics of the gun. It didn't seem to fit me as well as the later, single trigger Superposed guns that I had owned. It was bulky and felt generally oversized. So I sold it on with no regrets. There were some early "double-single" Superposed guns in which if either trigger was pulled, it could be pulled again to fire the other barrel. Or the other trigger would do the same thing. I've never used one so I can't say how they performed.
