I just finished reading Inversions. It's a novel set in Iain Banks massive Culture setting, but at the same time not. If you haven't read any Culture novels before, don't start with this. If you have, you may either love or hate this depending on whether you read Banks ...
If you haven't read Iain Banks' books about The Culture you should be ashamed.
I've seen it referred to as dystopic some places, though I never found it that way, and this is what Iain Banks had to say about it himself in a reasonably interesting recent CNN ...