I read only about half of this book and then skimmed some of the rest.
I liked this book because it conveyed very well how the ELF (and probably the ALF) actually work. It's not a secret organization. There is no central organization or ideology. People just get mad and then do stuff, mostly illegal. I admire the passion of the people involved. Evidently the author becomes a spokesperson for the group despite having never really participated in their actions (the really illegal ones, anyway), and not even knowing who the persons were. In fact, not knowing the people who actually committed the actions is a plus for being the spokesperson, since even if the FBI has captured the person and administers truth serum (or whatever) they can't implicate the guilty parties.
I do not identify with the ELF or ALF, not so much because of the violence / nonviolence issue -- the ELF actions were against property -- but for other reasons. It seems an odd way to build a movement in such a chaotic way, and the author documents very well the kind of problems this level of disorganization creates. Also, there is no need to inflict further "damage" to "the system." The system is apparently going to implode of its own accord; this process has already started. The October 2008 financial crisis, just by itself, inflicted more damage than the ELF could ever hope to do, and there's more on the way. Stay tuned.