Well it is not to rant and rather to collate what sort of bugs you can see with Window 10 for Phones preview on your supported devices. It is well-known that Window 10 for Phones preview will come with bugs and we have to play role of responsible "Windows Insiders"
Well after mockup / concept Windows Mobile 10 screenshots from Italy, time to have a look at what looks like an official early design for Windows Mobile 10. The above screenshot is from TechEd Europe keynote video by Microsoft's Joe Belfiore. Again, since the screenshot mentions "early design and not the final