it was absolute trash with 10.0, a lot better with 10.1.1 though not quite at what it was with 9.x

10.0 affected my Ultra's battery, basically reduced it by half a day. 10.1.1 seemed to have fixed it

I hate my watch now.

Your measure is a bit flawed since you don't get to see the result until posting an option so 'I didn't notice' might have been good to include.

My watch can't make it halfway through the day anymore over the last few days. I've had two friends say they've been experiencing the same thing this past week too.