Lumia 1520
I had much of the troubles reported (black screen, access to Windows Account, etc). but after a few soft and hard resets, everything started working. I reinstalled my apps, configured things up and it is running like a charm now. Smooth, fluid and flawless. I have notifications for my email accounts and messaging, except WhatsApp. Most likely, WhatsApp will need to be updated for WM10.
The updated Translator App is fantastic and does not require clipboarder to copy translations. I am loving being able to download maps to my SD card. Battery life is good and no heating issues.
If 10572 is this good, I can't wait for 10575!!! I think we can all feel that it is getting close to final!
My suggestion to those who still have troubles......go back to 8.1 with a clean install (do not restore). Let all the apps update themselves and finish. Then download Windows Insider App, go to Fast Ring and get 10572.