I have both Soul Cards decks, and I like using them as a single deck.
As far as readings go,in my experience, they have one of the most unique ways of reading...which is that there are absolutely no rules and no single way of working with them.
Sometimes, they are great for meditative one card daily draws...other times, they open up dialogues with "others" in a way similar to the Faerie Oracle...and sometimes they have extremely clear messages for me in the symbols that jump out in a spread...and sometimes they frustrate me, like a crystal scrying session...and I just have to write down everything I see or feel, and review my notes at a later time when they make more sense.
There are not many other decks in my collection that do this for me! Which is why I will always highly recommend them as an oracle, no matter what your reading style!