This mod works fine from what I can see (tried a couple of RM and DM matches and seemed to do exactly what it says on the tin). The idea isn't that bad and makes for effectively a 500 unit game on 50 settings. Online you could have a 2000 unit per civ game.
Palmyran bug mentioned is more to do with the tech tree than anything else. This can be changed.
Worth downloading if you and a friend fancy a larger unit multiplayer battle. You will both need to be using the same version of the empires.dat file to play this mod online (as already mentioned in the instructions).
It has limited use in single player as the default AI doesn't remotely attempt to exceed 50 units.