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.
I bought it after reading so many good reviews. But it has an unpleasant smell that I could not get rid of. It is the smell of the foam. As it is placed behind your head, you will smell it all the time. It spoils the nice leather smell of my new car.