I have this book (and also some more modern editions) and although it describes the state of Perl art around the turn of the century, it is still very valuable. Of course it won't discuss the "Modern Perl" we now all use (don't we?) but the basics haven't changed that much. Provided you know its limitations and you keep yourself updated on the newer Perl functions, I would not hesitate for a second to order this book.

And besides, anyone having this book on his shelf can claim to be "an old Perl hacker". (BTW: I still have the "pink Camel" book which describes Perl 4!)