User blog comment:AndImBatman/Call of Duty: Black Ops II Review - Die Rise/@comment-3967954-20130204225649

For the record, Who's Who is one of the best perks in Zombies. You do realise that if you go down and you revive yourself, you keep all your perks, right? Plus, if you can't for whatever reason revive yourself, the doppelganger takes over from the downed player - you can just buy all your perks back whilst playing as the doppelganger and continue from there. It really is a very, very useful perk indeed, and basically superior to Quick Revive.