This series introduces the idea of primary sources to younger audiences, which definitely appeals to me. Every child should be able to see images and "hear" the real voices of the time period as they learn about real people. I think this is a lesson that can be taught well before middle and high school, especially when we use images as our primary sources.
The actual writing style comes across as a little dry, but the pictures and quotes make it a bit more interesting. The fact that the books are short will hopefully make it enticing to my students that are attempting to branch out into new genres.