Game Usage
 Protoss vs Terran
Both Dark Templar and Reaver drops are effective at delaying Terran production and to gain map control. Shuttles are useful later in the game for loading Zealots and High Templar to target Siege Tanks.
 Protoss vs Zerg
Shuttles with speed upgrade are very important if Protoss decides to go Corsair/Reaver.
 Protoss vs Protoss
Shuttle/Reaver micro is a key point of PvP. Mid-game battles are often decided by who had superior Shuttle micro. If Shuttle speed is upgraded, Reaver drops are mainly used to attack Probes.