I have not yet tested the integrated gps during a sporting activity because apps have been slow to offer this functionality (based on tests and reviews took on the net, it appears that no shows connected is the recommended tool) .
The screen quality (poor in the tests) is not a concern as to the use of a watch connected.
And its square screen is more suitable than a round screen.
Allows you to listen to music with a Bluetooth headset (currently only Google Play Music).
Google Maps allows to follow the instructions (transmitted by the phone and the phone's gps).
Autonomy see 1.5 days 2 days if not misused.
Clarification: there is no wifi.
If you seek a beautiful watch that looks like a classic watch, then go your way.
Its look is rather that of a sports watch.
The screen is not centered, the top and bottom edges are uneven.
Big negative: the plastic bracelet is poor: it captures dust and quickly presents a dull ...
In short, far from essential, but offers a real plus in the life of a connected person ...