Last night I downloaded the client onto my Feisty Fawn machine. I wasn't really expecting it to work right off the bat, but it did!, except for a few little things:
I noticed that the client often freezes and crashes if I alt-tab to other applications or to other gnome workspaces.
It also started freezing up on login, getting stuck at the decoding UI images step. After messing around with it for a while, I discovered that if I repositioned the client window, it would get unstuck and successfully complete the login.
Otherwise, works great, looks great. I was on for several hours without interruption.
Later, I can post some of the terminal output around these issues if anyone thinks it would be helpful.