Is the Civilization IV expansions worth it? Or is the full game on its own good enough.?

There's a special deal for Civ IV on steam and I was wondering if the expansions are really worth the extra price.Is the Civilization IV expansions worth it? Or is the full game on its own good enough.?
Beyond the Sword is definitely worth the price. One of the most complete expansion packs I've seen since the old Blizzard expansions (Brood War, Lord of Destruction etc.). Just a ton of additions, buildings, techs, units, scenarios...Is the Civilization IV expansions worth it? Or is the full game on its own good enough.?
Well at the price they are currently available for on Steam they are definitely worth it. You can get the game and all the expansions for about $10 (I'm estimating based on UK prices)