Last year "New Scientist" magazine had an article where famous scientists named their "favourite forgotten SF masterpieces" and this was one of the books mentioned. The fact that there were only seven reviews prior to this one but they were all five stars would seem to confirm the said famous scientists opinion, but I'm afraid I have to differ. I've never enjoyed an SF book less. I found the plot confusing and disjointed, and except for the heroine (and not always her) I couldn't understand the motivations of the characters (of which there were too many).
For me the book didn't read like a novel but rather as a treatment for a lurid, violent, sexually explicit SF soap opera, and to be honest, if it were ever made I would probably watch it!