The big big big pro of this deck - the artwork is more than STUNNING imho. Also, many thought provoking scenes. And I love how the deck uses many different perspectives, from bird's view to close-ups, and it is always a well chosen perspective for the particular scene.
The down side for me is... I just can't warm up to that narrative concept (with the exception of the Secret Tarot, which reads beautifully for me). Extra trouble with the Mona Lisa is that the recurring characters are often set in similar scenes, so I find it hard to distinguish some cards (like the Pope guy being poisoned, lying on his deathbed, being mourned ... all very alike).
The readings I've done with it so far came out rather veiled, too, like the deck keeps hinting at things and always has something else up its sleeve. Let's see how it develops...