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.
Do not buy if you are wanting to be able to get a replacement straw. Can't find them anywhere and the ones for sale on amazon that say they fit f401 aren't the same as they sit taller and prevent the lid from closing. If I knew this I wouldn't have bought it