The Blue Bowl How Efficient is it for Fine Gold Recovery ???

I ran the blue bowl full bore to see how much of the fine gold would be blow out. How efficient is the Blue bowl at recovering fine gold? I had to find out if the blue bowl was worth it or do I need to go back to a clean up sluice and a gold pan.
Music poprockbed by Audionautix is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/