Yes I have. The installation process shows a progress bar in an old-school bevel/embossed window, underlined with the filename it's writing. On my computer it showed alerts in the middle. Once started, it's just a normal Linux with sharp edges. Installation of at least one of my programs (probably IntelliJ) crashed, I think I succeeded to fix that using advice from Stack Overflow and the command-line, if I remember. Definitely working, but definitely not the experience we'd like.

It's already a great OS, to be honest, but what about adding 20-100 employees and making it a blockbuster?