France's Matthew: Evangelist and Teacher is an excellent extended introduction to the Gospel of Matthew. Though the first four chapters are somewhat boring and technical (but important!), chapters 5-7 are especially rewarding and beneficial. France's chapters on Fulfillment, Matthew and Israel, and Matthew's Gospel and the Church would greatly benefit anyone desiring to understand the Gospel of Matthew better. I found these chapters to be particularly enlightening and edifying.
Though the back of the book says that its designed for a non-specialist readership, some parts of the book may be difficult for those without formal education. However, with perseverance it could be beneficial for any Christian and student of the Bible!