An extremely powerful card at even the worst of times. For the cost of 3 credits and a click you get to not only check archives and keep the corp honest, you also get to see a card from HQ and R&D for your trouble. As icing up archives is usually not a priority for the corp, you will likely get in with little to no issues, and have the value of a run on all three centrals for just 1 click.
The real kicker though, the one everyone is talking about, is that this card works in combination with The Turning Wheel. Build up counters over the course of the game, and when you are ready to win, play D&C for a huge access on both HQ and R&D, giving your counters double the value for a fraction of the cost, provided archives is easy to get into. Also synergizes with Black Hat, so Sunny can fire that and then use this card to immediately see the top 3 cards of R&D and 3 cards in HQ. A costly turn, but potentially game winning on itself.
The mere existence of this card means corps will have to return to properly icing all three central servers, such as during the heyday of Temüjin Contract, lest they want to lose to this card.