I have the deck. I don't read it on its own, but in combination with my Napo Tarot (which also has a US southwestern flavor). As a combo, it gives amazing messages, but I do have to refer to the booklet to clarify the meanings. IMHO, the deck is worth purchasing if you are drawn to desert imagery or US southwest red rock imagery. The pics are basic and simplistic, yet absolutely beautiful and capable of delivering a message.
I don't know the exact dimensions, but they are not large and unwieldy. Maybe a little larger than poker size, and more square-ish than rectangular.