I got one recently to process my drywasher cons, cuts the panning time by at least 75%. Pre soaking the cons from the drywasher riffle tray , then pouring off some of the chocolate milk liquified clay clod crap BEFORE running it through the Keene concentrator allows it to perform much better. For this purpose, it works really well and glad I bought one.
Thanks for the responses the link you shared Good guy was great. I agree Hard Prospector it does cut down the panning time. I can't believe the small gold it recovered. I would recommend it. Still have a few more buckets to run through my regular sluice when I am done I will post up some pics. Thanks again for the replies and help.