One of only watch together all the functionality of a phone (GSM, GPS, Bluetooth, WiFi, microSD, not the full Android wear, 8GB of storage and 1GB of RAM). And the interface is fluid !!!
Perfect for those who want their smartphone constantly at hand.
Beware though:
_ It is advisable to use a headset or bluetooth headset not everyone hear the conversations.
_ Because of the size of the screen, use minimalist keyboard applications to be comfortable (I strongly advice "Minnum keyboard" which has a very good word recognition and is very effective after a short learning curve) .
_ It is quite possible to put the Playstore until it formally incorporated, for all existing Android applications (see google)