The guidebook is very useful, until recently I've never even heard of the Morrigan before. Only thing I wish that was different is with the deck. The minor arcana cards need some art so that they could be differentiated better, numbers are fine an all -but they all look very similar and kind of loss the meaning that goes with traditional tarot decks with each minor arcana picture that makes them easy to interpret.
That being said though I'm still using the tarot deck, I just wish it had more artwork to go with the theme of the rest of the cards.