First off, a warning on this book - if graphic violence or descriptions of S/M sex bother or trigger you, you're probably better off giving this book a pass.
Califia does a really good job writing a novel that has plenty of hot sex, good plot, and compelling characters who grow and change. Which is not an easy balance by any means. The dystopian setting is compelling and far too possible and most of the characters inhabit various shades of gray (and the only exception is the villain of the book). The ways they grow and change is actually compelling and makes sense, and if the ending is sappy, it's the sort of sappy ending that sometimes (rarely) actually happens in life, and makes perfect sense if you want to give these larger-than-life outcasts a ray of happiness.
The sex is kinky and really S/M focused, and while other leatherdykes are probably going to find it really hot, I'm sure a lot of vanilla folk could find it really squicking. I was mainly just overjoyed that there is a lot of Femme top/butch bottom sex going on, but that could just be me.
The violence is really graphic - though as Califia points out in the introduction, people are fine with recounting women being victims in gory detail, but not with them taking vengeance. Plus, we're dealing with outlaw bikers, organized crime, and militant lesbian separatists in a post-apocalyptic world here - it's going to be violent.
I devoured this book in one lazy day when I had no work, and while I'm a fast reader, it's definitely a good book for a single day read. It moves quickly, and Califia has the same sense of urgency with this novel as he does with his pornographic short stories, despite the change in medium and bringing a lot more elements into focus. It's incredibly rare that I find a book (regardless of quality) that I can't put down.