Having purchased almost every review book in the known universe, I certainly agree that Rapid Review is best for path. I have just started to study or more accurately, think about studying for the boards.
I have liked Lippincott for Biochem and Pharm. BRS for Physio and Anatomy. For immuno, I have used a variety of sources and have not been wowed by any of them. The micro made ridiculously easy might be great for class but like the Lippincott's, I worry that these are too much for the review for boards.
I do like the questions from rapid review Pharm but then am a question person. The more the merrier. I will probably end up doing all the rapid reviews, BRS, Qreview, USMLERx and USMLEworld (not to mention the four retired exams) but this is how I learn best.