I think they are pretty lame. It is great in flavor but poor in playability. This is basically the same thing as Kamigawa split cards, which were pretty awful, only now they added a logistical nightmare to the equation. It appears as though they just wanted to try something cool but didn't really think enough about its implications on the game. There are so many issues with judge rulings that a lot of stores are not equipped to handle. Adding public information to drafts is quite problematic as well. Many of us have been in drafts where a card is known to be taken and it really skews a person's picks thereafter. While I am uncertain how many of these cards are really high picks, the thought of knowing or even revealing a color in a draft can be detrimental to a strategy. Think of how less of quality cards you will be passed if the person feeding you knows what color you are in, or vice versa. How many late pick Turn to Slags did you pass to the person who revealed they slammed a Koth pick one?

The solutions to solve this problem are not too great because it is near impossible to hide the card back while looking through the whole pack, let alone trust that the person after you will be taking the same care to hide that information. Game play is also problematic in that you can't really look at the flipped side of the card without revealing you have it in your hand. Granted, this means one should memorize the ins and outs of every card but I think we are all guilty of forgetting things as simple as whether or not an ability is a 'may.' I know early in M12 drafting I forgot whether or not Grand Abolisher said just Spells or Spells and Abilities when thinking of possible outs in my deck to an on-board Gideon's Lawkeeper. Things like that happen ALL the time.