Has anyone used J.W. HARRIS Cored Wire?

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http://www.jwharris.com/images/twentygauge.pdf http://www.jwharris.com/images/pdf2/TG.pdf This looks like an interesting product for doing sheet metal if it works as advertised.  What do you think?
Reply:I have used this wire, got a sample spool when it first came out, wasn't anything great, can do just as well with solid wire. Maybe it's better now, been over a year since I tried it out. Anyone else tried it? BW