I havent re-read the books as wholes, but Ive gone back over to read certain chapters and Ive noticed the re-reads have been very enjoyable, mostly because GRRM sprinkles tons of "Easter Egg" type of things. I've noticed so much more on second reads that I did not pick up the first time and maybe thats because I also skimmed through certain paragraphs and what not of what I thought was some of the boring stuff, but looking back, its actually mostly really interesting. Id like to re-read all the books to get that enjoyment, but thats a lot of time and dedication that I just dont have.