To calculate the overall star rating and percentage breakdown by star, we do not 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 is very useful for ease of changing locations. The only drawback is the power code. The place must have a power point nearby otherwise need a wire-extension. The wind is quite strong for close distance. Overall good product.