I'm not a very experienced player in Starcraft, but I've noticed that the new Tempest unit seems a little disappointing, despite its capabilities.  This made me wonder if I'm using it incorrectly, and led me to a few questions:

 - What's the most effective way to utilize the Tempest's long range?
 - How does the effectiveness of Tempests change from PvP, PvT, and PvZ?