Yes, but after turning it on is seems there is no way to turn it off (even if I change the battery profile manually it stays on "ultra saver" anyway until I reboot the phone). That would be the only bug I noticed.
I don't feel any change in battery life after switching from OS1.0.20.0 to OS2.0.109.0 few days ago. After a full day of mixed use (movies, OSM navigation, lots of social media) I still have ~30% juice left.