Darker then Black has got a be one of the better animes I've seen so far. The story line itself is really refreshing because differents parts of the overall story are being told per two episodes. This way you don't get the idea you're watching the same basic epidose over and over again.
The overall look and feel of this serie is also very good and the dvd-menus look very professional. The various dvd's contain some extra's like charachter desrictions and some basic art work.
The product itself is just a box with six dvd's, so no art-cards or booklets are included. Looking at the price though, I'd say it's excellent value for money.