I chose The Dunderheads because I was trying to see why it's hardly ever been checked out. Well... It's very short for one thing, yet it's in with all the chapter books. I thought about moving it to picture books, but the content is really for older kids. I think. The gist is a group of kids who work to outwit the mean old teacher. I like the various talents of the kids, but I think the book's downfall is the lack of true character development. There are SO many characters that they each only get one tiny role in the story. You don't really become attached to any of them.
On the other hand, the Popularity Papers is a total development of two characters, best friends Lydia and Julie take turns writing a journal hat chronicles their investigation and experimentation in becoming popular before they head to middle school. Great character development as you read their ideas and exploits, plus lots of little sketches and cartoons.
Nice modern take on things with a single mom in one family, and two dads in the other family. Nothing dramatic, just dealt with very naturally.
I think this one will fly off the shelves! Good thing I already bought the sequel too.