I was wondering why I the trades in PTW didn't match the ones posted... Anyways, that is a good pointer Immortal.
If you haven't already guessed I have PTW, and as Plexus said, it is worth every penny.
Also, I favor a switch from vanilla Civ3 next game.
One last thing, a good thing that happens when you install PTW is that your vanilla Civ3 stays there, so you can open plain games with it, ensuring that nothing gets changed even though you have PTW.