Educational Testing Service got interested in it long ago and then dumped it. The National Academy of Sciences did a huge project on improving human performance for the US military back in the 1980's, and they put it in the not useful category. What would you expect for an assessment developed by a team of two with no background in assessment?

I would extend your evaluation to say that it is not appropriate for use on others, but if you think that it helps you assess yourself, knock yourself out.