Not a fan of o so far. Haven't gotten a chance to check out the smart select stuff or whatever yet, or much features, but on stock 7.2.2, if I slid down my notifications and clicked the battery it would tell me where I was at and how much time I had left.
Now when I slide down notifications my batteries % shows next to the battery, but doesn't really give an estimate of time left. To see the estimate I have to actually go into settings. Further, it thinks I have a 1.5 hours left with 58% charge left on my pixel XL. Most likely that will get figured out better soon, since it was processing a lot for the upgrade, but thought it would have a better idea by now, since it's probably been a solid half hour since I upgraded.
edit: okay it finally jumped back up to 14 hours, ha.