Although I didn't use B&B exclusively, I did use it for the vast majority of my study time. I recently took the actual NBDE test a few days ago, so I can't comment on whether I passed or not (I hope I did..? haha), but I did want to comment about it now because I don't think many people use it. I thought it was an okay study material, not more than that. Probably the biggest caveat about using B&B is that it really does NOT cover the microbiology/systemic pathology section sufficiently (I think someone already mentioned this fact in another thread)! About two weeks before my test, I got skeptical about B&B so I quickly purchased the Mastery App and SO THANKFUL that I did, because the actual test required quite a bit of knowing which microorganism (bacteria/fungus/virus) is correlated with which symptom, etc. and this was covered nicely in the app. If I had to re-study for the exam, I definitely would have started with the Mastery App... but anyways I already took the test so let's see how it turns out. This was just my personal opinion/experience so feel free to add on to what I said 🙂