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.
The product itself would be great it was possible to register it with Akai; the serial number meant to register the controller on Akai’s website is invalid and unable to register, meaning it can’t fully be used. I’d expect that for used amazon orders, but not a brand new one.