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I haven't really noticed any major differences, other than Breathe reminders finally working again!! I feel like my Move ring does complete quicker than normal...so I'm unsure whether it's more accurate now, or less accurate...

My battery is at 41% and I pulled it off the charger yesterday after waking up...so I'm happy with that.
 
That being said, do you think it was worth it to update? Or should I stay with Watch OS 4? And avoid the update?

In my opinion, definitely worth the update. Even with the battery drain, I still feel that the upgrade was worth it.
 
I have a series 2 still under AppleCare. Put 5 on it followed by 5.01. Calendar sync does not work correctly, even with just 1 Apple calendar. I have an open case with Apple since Sept 24th. No updates or feedback unless I call them. Bought a new watch 4 on Oct 1. Calendars work as expected. I let my advisor(s) know that fact. Still no official response from Apple. Loosing faith in Apple. I will likely return the 4 this weekend. After all, what features will quit or be removed at the next update?
 
I have a series 2 still under AppleCare. Put 5 on it followed by 5.01. Calendar sync does not work correctly, even with just 1 Apple calendar. I have an open case with Apple since Sept 24th. No updates or feedback unless I call them. Bought a new watch 4 on Oct 1. Calendars work as expected. I let my advisor(s) know that fact. Still no official response from Apple. Loosing faith in Apple. I will likely return the 4 this weekend. After all, what features will quit or be removed at the next update?

Have you tried wiping the watch and starting fresh? I just added watch os5 and it's been running fine so far... I'll keep everyone updated..
 
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