It's kind of a mix. You can update quickly without burning battery on changes, but it needs power to keep displaying things. On the other hand I'm not sure that's a bug on a watch; I don't want it to display the last time before its battery died indefinitely. And it does work in direct sunlight which is great

> I don't want it to display the last time before its battery died indefinitely.

That seems like an easy fix: Make the software switch to something else (like a “charge me” message) right before turning off for lack of power.