To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
All I've heard is the "old" formula beats the "new" formula. You can only get the new formula on the B&B website so if you desire the old vs the new formula you'd better get it here before it's gone forever. I'm not a big fan; it doesn't deliver as advertised, but it's better than the "regular" formula you are going to find in the general marketplace.