Credibility comes only from a degree in your world?
From what I've seen, MM has a post-grad in this stuff from experience if not from an institution of higher learning.
For what its worth (I don't have a degree in communications, so maybe my experience won't suffice) I have emailed Sierra and found them very responsive.
I'd like to hear if their explaination is substantively different from that of MM. I have a feeling... and while you're at it check and see what sorts of degrees those guys have. You never know what sort of BS they're shoveling (or not shoveling... pun intended).
