*Not given step 1 yet*
I think it's a decent book to simply blast through. I like its Q/A format although these are not step 1 questions. They explain things well in their answers so a decent all round supplement for FA (Although obviously there are better books out there to supplement FA)
Having said all that I use it for day to day work to test myself on concepts and won't be using it for step 1 prep. My recommendation is to preview the book on Amazon to see if you like the format.