This says a lot about the skill and confidence of an astrologer. I can't guarantee that you will be "happy" with what I say (I don't make the future I only see it), but you should at least be satisfied with the quality of the reading. The professional way in which the reading was conducted, the level of accuracy and expertise. I always tell my clients:
If you are satisfied with the quality of the reading then please tell everyone ( Face Book, Twitter, etc). But, if you are not satisfied with the reading, for whatever reason---you are the sole judge and only your criteria matter---then do not tell anyone else but be sure to tell me and I will work with you so that you are satisfied.
This is not a money back guarantee but rather a guarantee of satisfaction.