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.
The problem with these is that it's very hard to stay in form. For everytime U get up from the couch, U must have to re organise it. If U ask Y I bought it, it was to protect the leather couch from pet scratches and stains.