I rewatched this last night and I'm glad that I did. This film really is up there with "The Mist" as excellent Stephen King horror adaptations.
The kids are all well acted (no "Kenny's" for those Brandon's Cult Movie Review fans) and every adult is amazingly unsympathetic. The kids are the only people you can like in the entire film.
Pennywise is a creature, which is exactly what he was supposed to be. I look forward to the sequel.