I've never got around to this. I was waiting for it to be finished, though I am watching the TV version. Having seen many, many discussions online about it though, I would advise making sure that you don't leave it too long and forget characters and plotlines, because there are so many and it can apparently get confusing if you leave it too long between books. Even people with good memories who don't usually re-read were saying they had to re-read to date if they were following as they came out.