Although I'd agree that "the mind does not exist" is not a bad way to get across their gist and certainly would convey more or less the right thing to people, as a sort of zero-th order approximation. Indeed, just the other day, I was thinking of writing an entry musing on something Dennett said and summarizing his viewpoint as "consciousness does not exist", which isn't quite right for the reason I gave above, but certainly gets one close.