[Baalz]

Also, one other point about PD that makes a big difference in some situations is that they don't demand any upkeep. If you're playing a nation with very low gold income (maybe a heavy blood nation, or LA Ermor) minimizing upkeep is vital. If you "real" troops are summons with no upkeep it can be a good idea to supplement them with PD rather than with recruited troops if you're not actively invading someone else.