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 was worried it would not work because it was NTSC format (not part of the description) but somehow still region 4 (as advertised in the description as normally it is PAL format. Either way it appears to work well on my DVD player and laptop, really happy with the price and product!