Anyone here have experience with knelson/Knudsen or copy concentrator?

Has anyone used or witnessed both the knelson type hydraulic riffle cone versus the Knudsen or copy non hydraulic spinner cone ?
How effective are the knudsons and would I pretty well accomplish the same result as a wilfley table and smelt?
I have many questions if anyone has experience in recovering fine and coarse free milling Au, or could possibly direct me to someone that has.

Mount baker mining on youtube is your place to go.
Jason even answers all questions sent to him as welk