Well, I had this game long before GOG did. While the game itself isn't terrible, (but it is fairly bad) It will eat up a massive amount of your free time if you let it. The UI kinda fights you harder then the AI does, and control of ships in combat is nearly impossible. From one play through to the next your research options change. Dramatically. This can change the playability alot, and your ability to control what's going on can range anywhere from workable to impossible. I, like most everyone else, sincerely wish this had been a genuine successor to MOO2, The way the Civ Games work from one generation to the next so well, But as it isn't, I cannot recommend it. It IS a halfway-decent game on its own, but the gameplay issues and terrible failure to follow the previous game makes it a poor choice.
One of the few truly great games in history. It doesn't need a major write up, this combat is worth every penny of 6 dollars. While the free remake is functional and has had several things added into it, only the original can be the true epic that it is.