Bought it 2 days ago, I regret nothing.
I cannot say how's stressfull and at the same time exciting is the skirmish mode, and I mean this is a 15 years old game.
I was very very surprised to see that there's people still active at multiplayer, not like you are going to find bazillions of users but at least 5 to 6 are on line.
Just finished the Alien campaign on Director's cut, awesome game.
Buy it, don't hesitate on it 4.99dlls is nothing.