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P&K gives you something that year 1 of law school sorely lacks: a context for the fragments in your case book. Its treatment of Palsgraf is particularly beautiful.
And since Prosser so strongly influenced tort law, you can be confident that you are getting good information. Some of my classmates used commercial outlines and they often worried about whether they could trust the material. No such problems with P&K; it was on the money all the time. And when there was a contradiction between P&K and my textbook, I was able to go to my professor and ask her about it. Try doing that with a commercial outline.
P&K is not merely fine reference tool; it is a genuine work of literature. I love it, and I highly recommend it.
First of all, the most recent edition of this text dates from 1984. That means quite a bit of it is at least slightly out of date, and some of it is massively so (particularly in the field of products liability). For a more up-to-date hornbook, consider Dobbs. (I bought and used both.)
Second, when your torts professor talks about "black-letter law," s/he's not talking about this hornbook or any other; s/he's usually talking about the Restatement (Second) of Torts (or, in products liability, the Restatement (Third)). As much as I like hornbooks (and I am emphatically not a fan of the "casebook" approach), I have to say that if you want to get _one_ text to supplement your casebook, you should pick up _A Concise Restatement of Torts_ from the American Law Institute. And, ideally, you should memorize large portions of it.
Of course, you can do what I did: buy all three. It's a great investment, and it will pay off in your studies; Prosser and Keeton provide much helpful discussion of points that Dobbs treats more briefly, and the Concise Restatement is much easier to understand once you've digested the hornbook(s).
At any rate, this _is_ a classic text and you shouldn't go without it for any longer than necessary. Just be aware of what you're buying and set your priorities accordingly.
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