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.
I have one that is the same make but branded, however, this one is much harder to close have to use all my weight to do it. That being said I would buy it again, its good to drink out of, and have no problem getting it clean after.