An amazing expansion, can't come up with a better description then that.

User Rating: 9.5 | Starcraft: Brood War PC
First of all, the gameplay is extremely better off with the inclusion of this expansion as it adds a few helpful units and upgrades to a team that are an amazing help in any Battle.net match. Another great thing is the new story chapters 4-6 (One for each race, just like the first game, respectively) which should be played through by anyone wanting to play Star Craft's II separate campaigns. I, myself purchased Brood War and Star Craft in a set dubbed Battle Chest so I have always had its benefits. To anyone who does not have that...I say purchase it; nowadays it is probably only about $10. As a Terran player, I cannot imagine my marines firing without the support of medics or holding off air counter-attacks launched at my Battlecruisers without the rapid deployment of the Valkyrie's cluster missiles impacting against flesh and hull. For Zurg players, lurkers burrowed attacks are wonderful ways to destroy armies safely and the Devourers air-based spines will protect you well form any flying threats. The Protoss' dark templars are forever cloaked many sabotage a wonderful option, but when two fuse to create a dark archon it keeps getting better. The dark archon is able to take over an enemy's unit for building you enemy's own units as your own or simply just attacking from behind enemy lines. It's final ability is basically a giant "lockdown" ability that can freeze an entire mechanical fleet of squad. A definite welcome addition to Star Craft and I no longer play it without it.