Save your money. You can achieve equal results by simply reading this forum. Virtually all of the packaged kits are not worth the cost of buying. Worse than that is that they hold you captive by selling you overpriced chemical reagents that are generally available for much less money if you know what they are. That information, of course, is never revealed, so they can keep selling their wares to you at inflated prices.
You would be well advised to read Hoke's book on refining precious metal wastes. It will teach you the basics in how to test, and how to refine. Once you understand the principles involved you'll be able to process values with many common household chemicals. That information is readily available here on the forum. Read, read, read!
Harold
