Too little, too late for my AW7 that's at 86% capacity, which will be probably closer to 80% when Watch OS10 drops. When it was new I could go a week with only charging while in the shower, when it got to +/- 92% I started having to put it on the charger after feeding the dogs breakfast, at 86% I have to take it off as soon as I get up and put it on the charger.
Its all in the grand plan though, planned obsolescence, my sister got an Ultra so I'll probably wait to see if a U2 is coming this fall and then decide between U1 or U2.