I already have the game it it works well on my G4 1.25 DP running OS X 10.3.9, but I should warn everyone who also runs 10.3.9 that the latest Quicktime update breaks the game somewhat. There is a workaround:
Problems with Quicktime 7.1.5 and OS X 10.3.9
but I am hoping for a patch, either to the game or Quicktime to fix this. Luckily, I read about the problem before I updated Quicktime, so, using Quicktime 7.13, my game works wonderfully!
It's a great game, BTW, just like the other "Age of" games.
Now, I'm hoping for a Mac version of the expansion...