The M2M with WiFi I use + As a common data store (and exchange) for the smartphones, tablets and notebooks in the family + WiFi as if I want to control my camera in the wild by Android App + As an additional access if only a network jack, but no Wi-Fi is available. All these functions fulfilled it very well.
One star less there is for: - The battery life I have not determined exactly, but my feeling is it is quite short, estimated