I can't honestly think of a #sciencefiction #posthuman future society that's lived rent free in my head longer and more vibrantly than Ian Banks's Culture novels.
Maybe it's the idea of humanity existing in a post money, post work space where people figure out what they want to do with their lives and.... DO THAT :)
Or maybe it's the fact that the humans of that world have incredible control over their bodies.
You can simply decide whether or not you want to constantly shed DNA leavings of yourself, or, if you're currently female, you want to get pregnant or not.
I know there are plenty of cautionary tale aspects there too. The protagonist in The Player Of Games was arguably used ,abused and then ulimately discarded by The Machines in pursuit of growing The Culture, but for some reason I don't care and would very much enjoy at LEAST vacationing there if not living there permamently :)