Years going, but still in very early alpha. Highly unstable - lots of BSODs, apps crashes, graphical and UI corruptions. Drivers cannot be installed as Update Driver button still does nothing in Device Manager. Even most functions of basic Explorer still doesn't work, including buggy taskbar. Start Menu is similar to Windows 95 instead of more useful Windows XP like with app searchbar and most used apps.
Still dozens of years away from beta stage.