I absolutely loved the Monkey Wrench Gang and thought it was well written, funny, well-paced and so satirical and cynical that it put shame to anything previously written. To me, it should've ended as it did, on a cliffhanger... literally.
The sequel is a more virile, hated stab at the failings of Earth First! that was created in Abbey's image and is a much slower-paced book as Abbey has a tendency to wallow in his general irritation by everything. The same characters return, Sarvis, Seldom Seen, Abbzug and of course Hayduke to tackle the GOLIATH carving it's way across Arizona and destroying nature in it's path. However, not a lot really happens except Hadyke trying to round everyone up for a second run and Earth First! (and a hidden "Fuzzy Bookchin" guest appearance!) making a mess of their own chaos. But then again, Abbey wanted a Christ-like organisation in his image and when it didn't live up to his expectations he was a little disenchanted and disillusioned.
Despite the lack of exceptionalism that made "The Monkey Wrench Gang", "Hayduke Lives" does have some exceptional moments, and without trying to give too much away, Bishop Love munching on uranium, getting his ever-so-needed 12th wife and a spy on the gang to make sure they don't get up to no good means that there are some great laughs to be had on the way.
"Hayduke Lives" is a bit of a confused book but doesn't leave to the imagination what the end of "The Monkey Wrench Gang" did and should have done so it drags it's heels at time. That said, I read terrible reviews slating the book, went out and read it anyway and am now slating it - so give it a read anyway to have an opinion about it. It's not Abbey's best work and it's patchy but for the sequence with the GOLIATH at the end it's worth a go.