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.
Purchased in December, 2017 and in May, 2018, five months later and approximately 500 copies into a this cartridge, experiencing two rows of 12 blue marks on the long side of the page. Good thing I purchased the genuine HP product. Will now see how HP does in the return process since Amazon's return window was a month.