This is definitely a time travel story like no other. The psychology in the title is central to the whole idea, where the author is less interested in the usual challenges of time travel and more interested in the effects time travel has on the people who do it often. So, for instance, frequent time travels get used to meeting silvers (older versions of themselves) and greens (younger versions), even gathering with whole crowds of themselves they may or may not like that much. There's even non-tragic love affairs between people whose lives barely overlap.

But most central to this life is death--the fear of it when it's your own and a potential growing callousness toward it that's encouraged by TPTB. So the character is much more focused on characters than science. I suppose I wish I was more drawn in by the characters for that reason, but I didn't dislike any of them, so I enjoyed it just fine.