These are my results when testing with the March21st Update of Audio-Surf with CXGames for Linux 7.0.0.
Used express install for Steam GUI, then installed Audio-Surf. Launching AS from within Steam.
-When game initially launches, the game window appears in a larger window with black borders. Both the system cursor and game cursor appear simultaneously and move in corrolation with each other. This makes it a bit tricky to select options in windowed mode. Switching to fullscreen via the "Fullscreen" button corrects this. (Screenshot of symptom: http://badservo.com/external_links/as01.jpg)
-Switching to fullscreen mode via in-game maximize and restore buttons causes fullscreen game to appear beneath the gnome panel.
-In the song selection screens, there exists a bug in displaying folders/directories. Instead of each folder name appearing in a top-down list beside it's folder icon, all folder names appear on a single line at the top of the dialog. This makes it incredibly difficult to navigate and choose songs. (Screenshot of symptom: http://badservo.com/external_links/as02.jpg)
-Performance in the game itself is substantially lower than in native Windows. While a suitable framerate can be regained by lowering graphical options, even with a fluid a framerate, the mouse/keyboard controls seem slightly laggy making ti difficult to play.
-All other aspects of the game (modes, net connectivity, radio, etc.) appear to function perfectly.
Due to the severity of the file browsing bug, I'm rating this as Bronze. In the event that this single bug were corrected, I feel it would be deserving of a Silver rating.