I have been following Sonia's examples and tools from her books. My understanding is that these cards were created to reinforce you subtle psychic impressions that are coming from your Higher Self. It's a way of easily accessing your Higher Self. I have found them to be right on and they are helping me to trust my vibes. I was initially hesitant to try them, but I kept getting the nagging feeling that I should broaden my horizons and check them out. So, I did and I use them everyday along with the Ask Your Guides deck. Together, they are a beautiful complement.
Best to get these cards in conjunction with the books. Helps set an intention for the day, week, month, quarter, and year. Visual people will enjoy the designs for morning affirmations. Great for helping the mind focus on a positive outcome once the day breaks.