i bought the book last year, but didn't start using it until this year. I'm definitely not using this as a main practice source, however it has worked out well for my study schedule.
Since January, I've been reading/studying FA in the morning prior to class. When I finish a section in FA (usually read RR path as well), i'll do the FA questions for that section, just to make sure i'm retaining as i'm reading. The questions are def. geared specifically to FAs info; you won't find a questions to which the answer is not in FA.
Again, this is just like a "warm-up" to the real Qbanks i'm planning on using, like UWorld. I'm not in hardcore board study mode yet either and from what i've heard, this really isn't the source for that. Like i said, it's working for what i'm doing.