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 ordered one of these for my daughter and one of the nibs didn't work on it. I ordered another one for my aunt and none of the nibs worked so she had to return it. So I wouldn't recommend it unfortunately.