My school got it for us and my class had an abysmal first-time pass rate. I chose not to use it because I couldn't find any reviews on it. Looking back, that was the best decision I ever made.
Trust me: stick to the proven triad of UWorld, First Aid, and Goljan/Pathoma. This will work for both COMLEX and USMLE (which I highly, highly suggest you take).
Edit: if you're just trying to pass the COMLEX, you can use BBC (for example, if you failed a class or three or just have a very weak background). If you've been a student in the top third or quartile, do yourself a favor and don't touch it. If you only used BBC for USMLE you stand a good chance of failing it or just barely passing.