I got the Moon Oracle today; I've had the Radiant Sun for a while now.
I don't really use oracles all that much - I really struggle with their usual lack of a system. In the case of these two, though, that's not a problem!! I don't do very well with the Radiant Sun yet, but I think it's a matter of practise. I just don't have the memory that I used to, for the astrological information. I have a general idea of much of it, but remembering it easily enough to apply it all in a reading is beyond me, so I find myself relying on the book a LOT.
Since I got the Moon Oracle today, I've not had much of a chance to get to know it, but I really like the system so far. I've done two readings, both on the same question. The second I intended as a deeper exploration of what I gleaned from the first, and when one of the same cards turned up in both I was impressed. The cards tie in really well with one another and it's surprisingly easy for me to apply them to the question. The Moon Tables in the back are also invaluable! I don't know what I'll do when I get to the end of them in five years or so - I hope I'm still using the deck by that stage!
All in all, I'm really impressed with the Moon Oracle, and though I prefer the artwork in the Radiant Sun, I do find that one harder to use.
\m/ Kat