The GOG version of The Guild - Gold edition works well, but not well enough to be gold. On MacOS X using crossover games in windowed mode, "The Guild Gold (TnL)" version runs well but with some graphical glitches on the accounts page at the end of every year: this is just a little annoying and does not hinder progress or full playability.
Installs sublimely easily, plays well (if using the TnL version). The standard version tends to slow down on trying to extend properties on my system.