I'd not bother with any of the above: the books have been rushed out in a hurry, mostly by former players, ghostwriters and journalists rather than people whose first vocation is wordcraft, and by and large they ain't going to tell you that much that you didn't already know and/or couldn't glean from a bit of digging around on the web.

When there are so many good books published each year.. and so many books rejected despite being more worthy of publication... it seems a shame to support those who look to cash in on people getting carried away!