I saw IT Chapter 2 today. It is a good horror movie with some genuine suspense, but it is definitely not as good as the previous It chapter from two years ago. There are some changes in the movie from what happens in the book (although overall not really major changes IMO.) I was caught off guard by the running time as this movie is almost 3 hours long and most horror movies are about 2 hours or less. But if you have read the book or seen the previous IT then you should see this movie.
B+ (by comparison I give the previous IT from 2 years ago an A.)