Complete Trilogy? This was a quick read, and if the first part was the first book in the trilogy, I may never have read the second two.
The story starts out interesting, but then slogs along for a while. Eventually the characters and town begin to develop, and then it becomes a nice, slightly off-kilter, "Back to the Future"-style fantasy-romance story (there is even a Biff -- although not in the same role!)
Mr. Tingle keeps the details light, the characters flat, and if you think too hard the whole concept falters. However, I found it a fun read with just a slight touch of humor and strangeness.
Hard to recommend, but by the end I was a little sorry to see it go. And unlike some of the other reviewers, I was content with the ending.