1. You can disable that annoying “headset safe volume” popup, although I don’t know if that’s even an issue in US. It is tied to some law in Europe.
2. When you’ve got an empty notification bar you will pulldown settings every time. This sounds stupid and small, but it’s really convenient.
Nav ring targets are pretty cool too, put I think PA has them too.
Don’t buy into “Halo” PA stuff yet by the way, it’s in alpha now and it’s kinda gimmicky right now, not much use for it really.