Hi If you have a gp3000 and you are finding gold, you know your machine, and not having problems with ground noise, Don't bother. But if you are struggling with mineralization, not finding much, digging false holes, or hot rocks, and can afford it $1200 here in Oz. Buy it try it and if you don't like it sell it. It is a one off, there will not be a superfix 2... To answer your question the superfix is an attachment that velcro's on the right hand side of your detector, I posted a photo titled Talbot weekend I think it was in november... ..arahi.....