UPDATE: long after more than 1 year experience.
Now available for the Ativ S, the long-awaited Windows Phone 8.1.
Personally, I now find everything better than it already was.
There is the notification Center. It is now Apps etc. also to the SD card pack.
One can make purely up to 64GB Micro SD card.
There are meanwhile more than 300,000 apps. All the necessary free. Also flightradar24 or Call A Bike, very useful!
It ultimately comes to the individual whether or not you like it .... Enjoy :)