Spotlight-l** is still here (better since 9.2, but still), but overall, animations seams smoother on iPhone 6 with that beta. Frame drops are now difficult to find after more or less 12 hours of use. Pretty happy about that update. Now I'm waiting for tons of imprecisions that I imagine have very low priority, but needs to be fixed if Apple wants to prove to customers that it really cares about the details (and I'm not speaking of UI design decisions).
I'm thinking about the dark keyboard flash when pressing shift key, about the Photos app scroll shifting when you press the select button, about the Settings app scroll shifting when you click on a row quickly after scrolling, about the terrible icon alignment in Apple Music (cf. screenshot) and that terrible "no results" state (cf. screenshot). I am unfortunately missing other small things that are not bugs, but where fixes need to be done. And I'm reporting them constantly via feedback form and bug reporter for some of them.