I didn't like it.
I didn't find it helped at all because of the way the material was presented.
It's nice and compact which makes it nice to carry around if you want to learn some facts here and there though.
If the book works for you, use it. Don't use too many resources though.
I think it's a decent book that doesn't have a good role in Step 1 prep. The content is fine but there's nothing in it that you won't learn from FA + a good path review book.