Android O could be around the corner, but some devices still have some catching up to do. Asus ZenPad Z8 runs on Android Marshmallow, but not for long - the device started getting an update to Android Nougat 7.0 and soon all customers should receive it.
The software version of the update is V5.4.1 and will bring you Multi-Window mode where you can use two apps at once. Another notable Nougat feature that hits the ZenPad Z8 is the quick switch between apps that works with a double tap on the Overview/Recent Apps button.
Notification settings are easily reachable with a long press on a notification. This is useful when you get annoying notifications from apps you rarely use. Quick settings are now customizable and setting them up is drag-and-drop easy.