After a few days with this watch I say great (I have tested 3 other before). Great autonomy. Returning to the cardio belt for sport but it is the only reliable solutions. The integrated sensors on the watch it only works on the sofa so not very useful. With movements or sweat measurements become heretics.
Only drawback of Bluetooth synchronization problems connected with the Garmin software (known and unresolved problem at present).
A lack: the live MP3 playback from shows like Gear S for example, if we want to do sports to music it is necessary to wrestle the phone unfortunately.