The marking system is, yes, unique. Is it uniquely good? It is a reader marking system, and suffers from the same shortcoming that ALL readers that I've ever seen exhibit: THE MARKINGS ARE UPSIDE DOWN! Buyers of marked decks (readers) have two main concerns: 1, Is it easy for the performer to read, and 2, is it so easy that speccys will see it?
Let's take no. 2 first. No, the likelihood that a layperson will see the markings, unless the performer presents an effect in such a way that a marked deck is to the spectator the only possible solution, is close to zero. As for the first concern, is it easy for the performer to read? One criteria for a good MD is that the markings should be on or near the corners, and possibly sides, so that they can be visible to the performer if the cards are spread or fanned. In a left to right spread, only the non-index corners need be marked. However, every marketed reader deck that I've ever seen, including this one, has the markings UPSIDE DOWN, making it more difficult for the performer to read them. What do I mean by upside down? Take a card that you have laying around and lay it face down in front of you. If you wanted to mark the card in this experiment with a magic marker, which non-index corner would you mark? The lower right-hand corner. It's obvious. It's the part of the card nearest to you, and should, therefore, be marked "right side up". Otherwise, it would be like trying to read a book that is upside down. A person CAN read a word or sentence upside down but given a choice, I'd bet that over 99% of us would rather have it right side up. And it's naturally easier to read something that's closer to you than farther away, and the lower right-hand corner is closer to you than the upper left hand corner. But the markings closest to the performer on this deck are upside down!
I'd buy more DMC Elites if they'd change the markings so I could read them more easily - RIGHT SIDE UP! My .03.