I made it a little over halfway through before I gave up. It's not that the book was bad -- it wasn't badly written at all, and there were several world building concepts that I thought were really interesting (like using old Fokkers and Sopwiths for fighting in the far future on alien worlds, due to the simplicity of manufacture, maintenance, and shipping). Unfortunately, it was a book about unpleasant people doing unpleasant things in unpleasant situations, and though I tried, I just couldn't get invested in any of the characters or situations. Not a bad book, just not a book for me.