Has anyone grown the blackberries that produce 20 gallons per plant?

Has anyone grown or know of anyone else who has purchased these plants? They come from Texas, and at $15 each, are pretty expensive, but are promoted as producing 20 to 30 gallons of fruit per plant. The articles say they don't sucker, and have to be tipped(?) Any ideas on them? I hate to spend the money and have them not produce as promised. thanks, Jan

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