Rarely do I use the Celtic Cross for reading myself but I do use it to read others because it offers a very clear picture of the topic or the reason the person is seeking a reading as well as solutions to the issue.
On each of the positions, with the exception of the 1 and 2 card, you can pull additional cards for clarification on that cards meaning if there is a lack of clarity on the meaning of that card in that position.
When pulling card for clarity, make sure you go back to position 1 and 2 to connect the dots.
Let me know in the comments if you use the Celtic Cross and what your experience has been or if you have tried it and what you like or dislike about it. I would love to hear your thoughts!