Don't care about what you see here, it is my playground :)
General appearance Rotation: OK, though bit slow Bottom bar is too narrow, compared to other UI elements. Bottom bar is missing shortcuts? Top bar not showing network and battery status. Top bar menu: layout broken.
Application grid 2 icons for Browser and Fennec. Touching and swiping doesn't work well (same issue in all apps as well). Starting apps takes 2 taps.
Voice calls Receiving call not possible unless Dialer app started. Call notification is not shown in HS (only inside Dialer app). Calling from call log works. Cannot input numbers via keyboard. Calling from People: works but needs an extra step in Dialer (doesn't call directly from People).
SMS Receiving not possible unless SMS app started.