My daughter loves this book. It's pretty easy to follow along with and she can do most of the work on her own. I'm not sure I like all the blue on the inside - trivial I know but it actually is distracting when looking at the word list.
We really enjoy these books. They are an excellent supplement to teach vocabulary. We are currently using them for our spelling program, as well and it has been wonderful because my children can work through the sections independently. One caution, however, they are not written from a Christian world view, so preview/preread the comprehension passages.