To the device itself:
The display is good to use very good and even in direct sunlight
Battery performance is enormous. With my old phone I was used to infect this every night - and even then the battery is often not enough for a whole working day.
The Fonepad I now have not been infected since 3 days and it still indicates 20% remaining battery. In pure standby mode with network enabled the battery over a week holds.
The speed is sufficient. The device has no hanger, I have an offline Navi TomTom installed and also various games (eg Angry Birds): everything runs smoothly
The internal memory is sufficient for most applications. Since the device has now been set by ASUS themselves on the Android 4.4.2 version back, the external memory can also be reused. An update to Android 5 is reportedly being planned.
The user interface (UI of the ZEN Asus) is very good and thoughtful. After an adjustment period that goes very smoothly by hand and has prepared some smart solutions for everyday life. Who does not want the ZEN-UI, it can to a large extent off (you have to stop extra-edit any app - a bit tedious, but it works!). I had previously a Google Nexus device and you can see almost no difference to stock Android with ZEN disabled (which was personally wichtg me because I ZEN disabled).
Big minus: The camera. Those who value the Photo function, you will be disappointed here. The 2MP main camera does not provide beautiful images and is intended for emergencies only. The 0.3-MP front camera is useful for video chats, there is more to hardly tell.
Otherwise, the device has a fantastic price / performance ratio. For not quite 200, - Euro you get a recent and very good device, which is more than sufficient for most applications and Apps.
Anyone looking for a cheap mix of smartphone and tablet (because he, for example - would not lug around 2 devices - like me) is at the right place. Full recommendation on my part.