It might be good to take the letter to a lawyer anyway, as there is no competing product being sold here, there is no competition, so that part of their case falls apart. The "numerous unverifiable comments which attempt to make “factual” testimonials" could be applied to their site as well, where do they get that it's implied that this site is affiliated or authorized by Mr. Shellenback?
It seems to me that these lawyers are attempting to use scare tactics to restrict free speech. It's possible that you might have a case of some sort against them for harassment or a first amendment case or something.
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