I was under the impression that the "this is definitely not a book for beginners" was the standard consensus here: I seem to recall seeing some heavily-upvoted comments saying that you should be approximately at the level of a math/stats graduate student before reading it. I couldn't find them with a quick search, but here's one comment that explicitly recommends another book over it.

Open thread, January 25- February 1

by NancyLebovitz 1 min read25th Jan 2014318 comments

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If it's worth saying, but not worth its own post (even in Discussion), then it goes here.