Each one of these suckers is equal to about three regular-length books, and every one of these bajillion pages is good. I particularly like the way the authors made a future full of people of various colors, but the prejudice isn't racial, it's place of origin (Earth, Mars, Asteroid Belt). Way to represent and make it all future-y. Also an array of relationships that span a quite large gamut, and are all equally valid. And a good thing with age wherein no one's specific age is given, only their relative appearance to others. Keeps it universal by being unspecific about numbers but very specific about interaction.
But diversity isn't everything: they've got really interesting ideas about possible weird universal truths, and a firm grip on how people mostly behave and how they can behave, if they choose. Lots of alien stuff for the humans to react to. Just entertaining as all get-out.