Around 15 minutes into update from build 10572 to 10581 (Lumia 1520):
- Hard reset not seems to be needed. Comparing to what I had when I got 10572 (it was unusable before hard reset) this build is fine.
- Accent color changed to red from whatever I had. The rest of personalization seems to be fine.
- LockScreen, only text moves. Weather app is still nowhere in the lockscreen settings.
- Groove is as horrible as it was. If you start playing one song and add stuff to "Now Playing", it doesn't play the next song, but just stops, even though the button shows PAUSE, meaning it thinks it is playing something, if you repeat the same song it hiccups and stumbles in the beginning and the end of the song.
- Unable to connect my laptop to Mobile Hotspot. Just gives error before I can even enter the password.
- Wifi seems to be working OK.
- Hey Cortana works! YAY!
- Cortana's "Play *name_of_the_whatever*" is very sluggish and slow, but it works better than on 10572. Meaning at least it works.
- Cortana in general seems to be a bit faster, but not as smooth as W8.1 Denim.
- Pressing BACK button too fast now evokes the task view, that is annoying. Once it just opened on its own.
- There seems to be no notifications for incoming emails, yet when email is read, or even read and deleted, it still sows in the live tile until new emails will arrive, and the they will be stuck there.
- Motion data store update is still broken. There is an update for WIndowsCamera.
- After installing the update checked the RichCaptue: 3072x1728 resolution with main camera and 1280x720 with front. Front camera sucks.
UPDATE:
- There is no insider HUB.
- Background kind of 'jumps" when closing an app or scrolling fast on start screen.
- Forgot to mention, for me there was almost no black screen after the update.