Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Thought provoking certainly but not enjoyable!

I agree with much of prior reviewers comments about this book. Definitely thought provoking (but that could be done, and was done in a few pages). I found it meandered, lost its way, was generally hard work reading, and ultlimately I finished it because I had started it rather than I was getting any enjoyment out of it. SF is definitely my preferred reading matter, but htis is the first I have read of Greg Egan. Don't know if I will try any more Egan.