It was pretty unstable when I tried it a few months ago.  Kept crashing on me and slowed down my machine even more (Bitcoin-QT already does a number on it).

Will be great when 0.91 comes out with full support for OS X.  I've seen Armory running nicely on Windows so can't wait to have that stability on OS X as well.

Armory Dev Team,

Keep up the good work!