Have not used it, but the impression I got from the Kaplan sales pitch at our school is that the Physiology Q bank is best for review during your physiology blocks. The Q review package (standard Q bank + the clinical vingettes) is what I think most people get for board review. Together, the two parts of Q review give you over 3000 questions from all different topics (i.e. not just physiology). That should keep you plenty busy for board studying. Perhaps someone else can confirm or deny what I've said.