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.
Bought for the wife as a present as I already own one. Have had loads of cheap water bottles that leak but this one doesn't and the one I have had for over two years has not leaked once. Would highly recommend.