Valkyrie Warning
Submitted by gunwonder17

Valkrines can be a quick fix in small battles. But one thing i've learned the hardway from is that they will freeze up in big battles. So, I advise not building valkrines for a incoming battle cruiser army with wraiths protecting them, and definitly not against carriers. This is true for versions 1.08 down. Hopefully blizzard will repair this problem in their next patch.

CreepColony's Opinion: I heard that if valkyries are in groups of more than 8, they will not shoot their missiles. It is because of it's fancy attack, and if there are too many HALO Rockets flying everywhere it could slow down the game.