Yeah its strange that Turbos are twice as expensive as Ion Cannons, Ion Cannons are much more useful. They came in with an ISD and fighter killer escort once, while i only had a couple of Nebs and Ion Cannon. One shot with the Ion Cannon and the ISD was disabled for most of the fight so the nebs wiped out the fighter killers and the Y-Wings took out the ISD, they can help turn the tide of a battle.