Utterly useless.
15-30 minutes of Googling, particularly through coffee aficionado blogs, will teach you far more.
I mean, seriously, in an illustrated book about coffee you can't even show pictures of what the ideal grinds for various brewing approaches should look like? Dozens of worthless pictures of assorted coffee beans (ooh look! a picture of a coffee bean in a book about coffee!!!) and equipment that will never be used in a home, and you can't include pictures of the various grinds?!?!