Although I think OS 2.0 is an improvement in many ways. I still think there's some way to go.
A few pains that I've found:
A lot of apps don't close when you use the in-app quit, they minimize to cover instead, but I'm guessing this could mean the app needs updating to work properly in 2.0, maybe?
Apps that run like TSR's (Terminate & Stay Resident), i.e "ScreenTapShot" leave a cover background behind when you run them.
An issue that I have noticed, not sure if anyone else has this. I can't keep ambiences that I've created despite saving them to Top Menu. I can neither find them in the ambiences settings menu and they're not on the drop down list from the downward edge swipe.
Oh, and I preferred the single downward swipe to lock the device rather than having to tap the lock bar at the top.