The Battlecruiser is by far the most expensive terran unit but it can also be the most powerful. The Battlecruiser is best ueed is a group of five or more so that you don't get wasted by a unit or two. If you upgrade Yamahota Gun you can totally devestate enemy defense buildings before they can shoot you like you were a Siege Tank. Then you can use their guns to wipe out enemy forces. The Battlecruiser is an awsome unit that has lots of power and can take a lot of punishment before they blow up. I use them a lot for the front line of an assualt followed by a massive ground invasion.