A review by lamnatos
Diaspora by Greg Egan

adventurous challenging informative mysterious slow-paced
  • Plot- or character-driven? A mix
  • Strong character development? Yes
  • Loveable characters? N/A
  • Diverse cast of characters? Yes
  • Flaws of characters a main focus? No
I've seen it described as "diamond-hard SciFi", it might even be an understatement. It starts off being confusingly abstract. After ~15% it gets more coherent, slightly more corporeal, though never entirely so. 

Even through its abstract and detached universe, it revolves around modern issues of reality, subjectivity of perception and even memetic reality bubbles.

There's a lot to get from this, provided you can keep your mind clear enough to absorb the weirdness of it all.