I only do free flight, but so far everything works except for the video during the startup screen (but who cares?). My WinWing joystick works fine. No major graphical or stability issues yet. Loading and scenery download does seem maybe a little slower than on Windows. In some dialogs, the hovering the cursor directly over the button doesn't work, and you have to move it away a little bit to get it to focus on the button. Annoying, but not a big deal. I haven't tried VR, because my experience with that on Linux hasn't been great.