Here is a reviews of the fancy hog pan. In short, the hog pan is a very expensive classifier or grizzly separator that can accelerate your gold panning. It is built from aluminium and takes about 6 hours of labour and over 30 tig welds to produce. At a price of nearly $300, if you can afford it great!
Find more reviews at https://www.prospectingaustralia.com.au/forum/viewtopic.php?id=7437
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Otherwise, here is a simple home-made version.
You can also achieve the same thing as a hog pan on a budget: