I'm re-reading Alistair Reynolds Revelation Space series. The first time I read them, I read them out of sequence, and whilst they stood up well as individual books, I find on reading them in sequence, that I missed some of the detail carried from one book to another.
There's something about the experience of reading a book for the first time that isn't reproduced on re-reading it though. The first time I read Absolution Gap, I had a sense of how terrifying the whole Revelation Space world was. On re-reading, that fear isn't there any more. Its all become a bit too comfortable.