When I first received these, I could not stop laughing - they're HUGE!!!! But they were also my beloved Rider Waites and the only thing I am disappointed about is that I didn't get them sooner.
These cards are not much different (apart from size obviously) than the Original Riders which is why I love them so much. They have used medium card stock, and in US Games fashion, they are heavily heavily laminated which makes them durable. They also stink of plastic so need a bit of airing first.
So what are the benefits of having this size, is it just a gimmick? Definitely not. The images are much clearer because they are bigger, even my dreaded King of Pentacles - so dark in teh small cards, becomes clearer in these ones. The size of the image means that even on a brief glance - things that you've not noticed before will literally jump out at you leaving you wondering why you didn't notice that before. These are excellent for spreads like the Celtic Cross and others where the cards overlap, because they are not obscured by the crossing card. This avoids a lot of faffing around taht you sometimes get with the standard size cards. The only drawback to the cards is shuffling which for me, and I don't have small hands, can only really be done by putting them on the cloth and swishing them round in a big pool.
The images are clearer and the colours appear sharper on these cards - the 'gold' wash that is on teh standard size seems to have been corrected and you get to see the intended true yellow that they are meant to be.
These cards are brilliant for studying purposes, meditation and for reading (although you will need plenty of space), you will not be disappointed.