And without wishing to defend the 'Professor's' words, at least there is a disclaimer for such.
Yes, it is crap. But in the case that I cited earlier, there is no such disclaimer, but in the unearthed discussion, returns are possible without argument.
In this one finite case, I am not sure who is the better seller. 'Finite' being about dates and numbers. All else aside, one should always go with Dale of course.