I recently listened to this on audiobook which was very nicely read by Peter Kenny. It's interesting that Peter used a distinctly British accent for Gurgeh and quasi American accents for other members of the Culture. I wonder whether that's intentional as Gurgeh is written as quite a stand offish character.
I haven't read anything about Iain Banks himself, but does he have any affinity with games, as i think they're mentioned a few times over the course of the Culture series? Ships (battleships especially), too.
It's been a while since i read it and i think there's still a lot to unpack.
I think the book picks apart a lot about human attitudes. On the face of it, the Culture is very socialist, egalitarian and "fair", almost the perfect society, but I felt that there was still much desire for conflict, (usually done by way of Contact and Special Circumstances by proxy with some other, "lesser society). Juxtaposed to the Culture is the Empire of Azad which had a core element of posession and ownership to it. I always felt that the Empire of Azad was Banks criticism of Western culture and out obsession with money, things and show.
I also thought more on the sexist or bigotted parts in some elements of the book. Obviously, the Azadian Apices "owned" their males and females and the idea of "females selling themselves, usually within the contract of marriage" was an interesting thought. I also felt that Gurgeh was perhaps somewhat bigotted toward the Culture drones too.