Do not upgrade if at all possible. It does not matter if you push through Apps in Manage Devices or push through VPP assignment. With VPP assignment it becomes a phantom app in app store. It is listed in your purchased apps, but you can not download nor can you update nor can you open. If you push through Self-Service, it will act like it is downloading when you chose to install and once it is completed, it will disappear. So those of you setting up new devices or wiping old devices and are forced to use 7.1.2...pray for 7.1.3 will fix this.
