Re:What's the downside to using X11? (Score 1)

I can't paste text from Firefox into OpenOffice, because there's no common clipboard between X11 and Aqua. May it would work if I used the X11 version from Firefox...

On my Mac I just use [command]-c to copy and either [command]-v or Middle-Button-Click to paste, depending on whether the target is Aqua or X, respectively. If you don't have a 3-button mouse, you can use a combination of [control]-[option]-click to paste in X.