Finally got round too watching this, why do I do it. Expecting an adaption of the book, what I get is something with elements of the book and it is in two parts.
Messed about with timeline, Beverley is too grown up, Bill already has silver, the kids aren't very well fleshed out. Not enough on the barrens nor are Ben's construction skills mentioned. I feel the producers missed a trick not portraying the times spend in the barrens as central too the story, specially the den and the meditation scene. The film didn't get across the bond between the group. Also not happy that Ben's nickname Haystacks was never used or Bill's Big Bill. No one apart from Pennywise told Richie too beep beep.
Don't get me wrong I enjoyed it and I'm looking forward too the second part but unlike the Gunslinger that was so far away from the book it was easy to disassociate from it, this had too many elements of the book I was left slightly disappointed.