I disagree, JSWolf.

The blu-ray thing (along with betamax and minidisk) is meant as an illustration of Sony's tendency to back proprietary formats, so I figure it's a relevant point ... I don't find it
compelling, mind you, given the fact that Amazon seems to be playing the same proprietary format game, but there you go.
I think they cover some good details that folks might have questions about, and they come at it from a user perspective, so that's a valuable approach.
Just my 2¢ of course.