I was waiting eagerly for the Kwon to arrive after I purchased it, perhaps this heightened expectation is to blame for the slight sense of deflation as I read it.
The text has a fairly useful historical overview of the history of 'site' as an artistic idea, with a specifically American focus. One of my disappointments was that Kwon appears to be relying on secondary research, drawing from public art examples already extensively discussed in other public art texts, most notably those of Tom Finklepearl and Grant Kester. The book raises some interesting questions about the relationships between comissioning agents and artists in relation to the thorny problem of what constitutes an identifiable 'community.' These questions are however limited to a narrow interpretation of what public art practice is, remaining close to issues found in what has been called New Genre.
All in all useful as an introduction to the subject, a teaching tool for undergraduate students, but perhaps better as a companion text rather than a definitive source. If you have the Finklepearl already you may not need this one.