Time between charges.

OS 10 is NOT good on my S4.

Apple watchOS app for sleep is a cruel joke. Try the autosleep app by tantsissa (it can be tuned to your patterns).

You are spot on! My 45mm Apple Watch has the same problem with complication landing zones being smaller. And things like the weather app are harder to read. Battery life cut by 30% to 50%, with no 3rd party apps and no background app refresh, and no always on display. WOS10 feels like a cheap knock-off from Alibaba. I much prefer WOS9.6.3. I personally resent the changes Apple forced on my watch. I have always been an early adopter and looked forward to changes that improve functionality. But THIS WOS10 does NOT work for ME in so many big and small ways. Apple must surely have a wealth of user data that assures them this is the right way. But for me, NO, this is not the way. As such, I’m trying a Garmin watch and will be wearing my vintage Bulova watch. I will NOT be forced to upgrade to an S9 or Ultra2 because of WOS10. Apple–you can just duck-off with this idiotic set of forced major changes to the watch. I will be willing for forgive if given the option to roll back to 9.6.3.

My S4 is better with 10.1. Still not as good as 9.6.3, but better than 10.0.x.