I wanted to share that on the Series 4, 44mm - the battery life seems to be remarkably better under 5.0.1. It was good on 5, but just amazing on 5.0.1. I use the watch on WiFi/LTE and rarely directly connected to the phone over Bluetooth and with this update the battery drain is no longer a concern. I’m not sure if they optimized the WiFi chip or did something else, but all I can say is yes you can now use the watch away from your phone the entire day (WiFi most of the day) - and get along just fine. Will be doing further tests to see, but so far so good. A bright future ahead for the phone free watch user.