I have seen DD post on several message boards I have frequented over the eight plus years I have been investing in biotech. In spite of spending countless hours on diligence, I attribute most of my success to a combination of perseverance and dumb luck. I wish I had payed more attention to DD's postings on a couple of occasions. He has earned my respect. It does not bother me that he does not own any Ariad. I have consulted a couple of other experienced investors regarding this stock and while they liked it's prospects, they were not interested in investing in it. I would pay total attention to any negative concerns he might have.