I have bought the book a few weeks back and
I am not even one-fourth through. Still, as a
software professional and teacher, I do not fully
endorse the viewes of the other readers found in
this site. I have got an Indian edition of the
book and low-priced editions of both the UML
user's guide and reference guide by the
Three Amigoes are also available in India. I do
not think this book can pose any competition to
the Three Amigoes' books. But as a short and quick
reference it should serve some purpose.

The numerous errors however should not be ignored.
Oreilly or no Oreilly, I really do not think that
any good book should contain so many errors. The
errata, which I found today, however, is a good
compensatory effort.