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.
It's good to know that your computer and other electronic equipment is protected from power surges. Most important is that power will be shut off to your gear if the surge protection is no longer working. Otherwise you may think you are safe but not in reality as is the case with other brands.