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 just replaced the one I bought 10 months ago. It burned in our kitchen continuously, 7200 hours. For $5 not bad. But if it were to have lasted 20,000 hours as claimed, I would be writing this review 2 years from now.