I never had any issues with writings/calls, yet can let you know that there is a configuration imperfection with the watch that causes the GPS to blow a gasket when presented to dampness(think sweat or washing your hands). Sony has remarked that they will be putting out an overhauled band by the start of December that should right this.
Likewise, there was/is a battery channel bug that was presented in the May(Android 5.1.1) redesign that should have been altered in the Aug 20 overhaul. I’m seeing some criticism on different discussions that it is still broken and would prescribe watching out for it; the side effects are the watch will get warm and all of a sudden channel from full battery over the time of 1-4 hours.
I wound up giving back my Smart-watch 3 yet will be considering purchasing another when I’m sure every one of the issues have been resolved. Shockingly, my certainty is a determination was shaken when I ran all late spring with a smart-watch that was just mostly useful.