According to the Positive Feedback review the effects were so dramatic that it should be easy to carry out a succesful double blind test. Given how improbable this device is, I think the Clarks and Positive Feedback have an obligation to carry out this test to save their reputation. I'm trying to keep an open mind, but there seems to be a excuse to explain away every question.
I'm disappointed about what this says about high end audio in general - manufactures and reviewers are not to be trusted. Seems to me it hurts the industry and it discourages people from getting involved in the hobby.