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.
For bookends I was expecting something larger and heavier, and as such these are nearly useless. These are fine as long as you don't remove anything in-between them, otherwise everything falls over. One of my bookends arrived broken with the metal piece separated from the wood portion.