I've own the iPad Mini 3 since September 2015 and I'm really satisfied with it. This is my second iOS device ( the first one was an iPad 2) . I've used both iOS and Android, and I've gotta say both has their own perks. Android offers flexibility and freedom, while iOS offers reliability and security.
What I meant is that with Android you can customize lots of things, but as time goes on, the background apps starts to slow it down and you stopped getting software updates ( which often compromises security) . On the other hand iOS limits the things you can customize ( I am not even sure if there is anything you can customzie) , but you'll get software updates as soon as they are available, as long as your hardware is still capable.
Other than that, with iOS you can just use it and forget about the technical stuffs. It doesn't get slow unless your storage is full. You can just use it daily, and it always does it job well.
Currently I'm on iOS 10.2 and I've got no issue with the exception of the touch ID, which IMO gets less sensitive compared to iOS 9. It's harder to use than before.
Take it this way, iOS is like Toyota, it's reliable and proven. While Android is like Subaru, you can customize it to your heart's content, but it needs more attention and maintenance coool product ever had
Tl; dr : The iPad Mini 3 just works, that's it!
