My residency gave us free access to BoardVitals. A couple of questions had incorrect details, but they're details that every other board review source also had wrong (half-lives of certain meds being the most notable subject of debate). BV will get you up to 40 CME hours but you get credit per questions you're finishing and it costs extra, so have to finish the whole Qbank for the full 40 hours.
I don't think BTB was overrated, but I don't think just trying to go through the entire thing is the way to use it. Look at your PRITE scores and see where your areas of weakness are. For me it was imaging, neuro, and NCDs so I just did those in depth with BTB and scored pretty well there. The nice thing about BTB is that if you sign up with a group it's half price and will get you 53 CME hours if you do the test at the end (which is not hard). So you can hit your weaknesses and finish your CME for the year with just that, the CME is what makes it worth the (discounted) price imo.