Works almost perfectly, with the exception of few minor graphic glitches.
The glitches I've noticed.
When you start up the game you get a white screen. Press the "tab" button.
In rare cases the minimap doesn't show the map. To fix, save and load the game. (Or anything that might trigger a minimap refresh)
And in few cases after speeding in a vehicle, and then exiting, the screen is fuzzy, (like when speeding), this goes away after few seconds.
Other than that its perfect.
Running on:
Macbook Pro 2.33 GHz Intel Core Duo
Mac OS X Leopard 10.5.8
Steam on Crossover Games 8.0.0