I've got a couple of the books - the two that Dash appear in, specifically. I've read one of them, and its okay. It's a kids book, and it's weird to read something that doesn't care too much about details (its no G.R.R. Martin epic...) or whether something is actually possible (like, Dash flying a handglider and using a chainsaw with precision....). But its a fast read and it does reference the show and already established eps, and they seem to carry on where the show left off.