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.
Only reason for 4 stars is that they are slightly more painful thank the NovoFine. Not enough for me to switch back and pay more, but as long as I stick myself in a fattier area (for me it’s thigh, arm or stomach) it doesn’t hurt as bad.