I have a copy of every one of Caroline Smith's decks (Elemental, Mystic Meg, Moon Oracle, Runic Tarot, Radiant Sun) - and the last three have different systems - the first 2 are regular tarot.
To be sure, I haven't worked with any of these decks much - right now with Uranus opposing my SU/MA/ME conjunction you can say that my thoughts are really SCATTERED - but if you love the art, you'll love the decks. The problem with the Radiant sun is the packaging - you'll need a deck box or bag immediately, because the book is part of the packaging, and there is no way to secure the cards. The moon oracle is packaged well - the cards are in their own box, and the book is substantial. It's 127 pages, and while not as astrological as the radiant sun, it does have to do with the moon's current sign and phase. (It's moon phases, goddesses (linked to the astrological signs, and moon mansions - 28 cards). Just glancing through the book, there are some weird typos - showing the Hecate card labeled "ishtar" (which the card isn't, thankfully), and referring to the astro glyph for libra (Gaia? WTF?) as cancer (cancer is hera, the wife, makes less sense to me, she's not the mother... though demeter/ceres as virgo is perfect)
Anyway, it's an interesting combination of goddesses, astro signs, moon phases, and moon mansions. I like it, and getting it out just now, I'll probably spend some time with it tonight.
What Lunakasha said re: radiant sun. (which is not typical of the artist's style, fwiw)
Sravana