Summary: To redeem, you have to install the Arc client (a new front-end), click on your account name in the upper right, click on "My account," then on "Manage Subscriptions." There will be a radio button for Redeem Card that should accept the code on these.
Summary: Paying about $10 USD for 60 days is an incredible bargain. Since it usually costs $15 USD a month (30 days) for a regular subscription, I recommend purchasing these cards if you wish to Subscribe to this game.
Summary: Although the game's moved to a subscription-optional model and is being administered by a new company (Perfect World), the codes on these time cards are still honored for 60 days of gold level membership. With a price point lower than the base subscription price, it's kind of a no-brainer.