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My son in second grade LOVES this series and asked for more of these books from Santa for Christmas. He takes them to school with him every day so he can read them on the bus and compare notes with his friends who are reading other books from this series. I'm willing to buy any book that gets my kid this excited about reading.
I've read all the Ranger in Time books with my son. He's now a 3rd grader who reads way above this level and still counts these as his favorite series. (We pre-order them because he loves them so much.) He was enamored with D-Day, especially after learning a bit in school about World War II and can't wait for the book on Hurricane Katrina to be published.