I'm half way through the 4th book at the moment (the first three I read the other week, one a day, but I haven't had as much spare time for #4). I saw the 3 movies last week.... I waited all this time to see the movies because I was worried about the movies spoiling the experience of reading the books for the first time.
I enjoyed the movies, especially the character of Hermione, and Emma Watson's portrayal of her. I laugh at that character in the books more than anything (especially the 4th book.... I kept laughing out loud on the train today).
It's almost been like being a kid (well, teenager) again and reading C.S.Lewis' "Narnia" chronicles for the first time.
Although, all the non-human animal flesh consumption and exploitation of non-humans can get to be a bit much (I love Hermione's "elf liberation" activism.... although I am just up to that chapter so no-one mention where it goes..... actually, maybe I better stay out of this thread until I finish books 4 and 5).