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.
It's overprices, as it's really $1-2 in materials, but you can quickly have your D90 (or D80) ready to go. I received the genuine article, which despite it's extreme cost (buying used help a lot) is worth it when you capture the right shot as opposed to reloading the tray (which takes far too long).
So it meets a 5 star need, but it's really a 1-2 star value. YMMV.