The cast of kids and adults are great, in fact I can't think of any other movie where this is pulled off so well. Jonathan Brandis and Emily Perkins stand out in the younger crew as do their older incarnations in Richard Thomas and Annette O'Toole.
Tim Curry's malevolent clown steals every scene.
Alas, the whole is let down by a lame monster finale - a fault with the source material as well - but even worse when realised on the screen.