The marking system on these cards is too complicated. The color and one-way markings are good and easy to read. I find the suit an value markings complicated and the Mnemonica and Aronson markings just add to the confusion. Besides, if you're a hard core mnemonica user, once you know the suit and value of the card, you know its position (so adding this info on the card is redundant). Perhaps it's a matter of preference but I find other systems - e.g. Mint System, Butterfly deck and Gamblers - less conspicuous and easier to use. If you have to stare at the back of a card for more than 3 seconds to read the marking you might as well carry a sign on your chest that reads: I'm using a marked deck!