If you have not used a spinner before then I would suggest that you first use something that require more human imput like The Best Spinner or Spinner Chief in order to understand the basic principles. However if you must go fully auto then I would suggest you go for Wicked Article Creator. I have it and understand it is similar to wordAI but a one off fee of $47.
As you can see, WordAI is a lot more loose with the meaning of the text and uses synonyms wherever it can in order to produce the most unique content possible – this one is calculated at 98% uniqueness. Again, the purpose of such content should be for the lower tiers where you would need a higher quantity of links with not that high quality content.
"It is my pleasure to give testimonial about this spinner tool. I think this is great and highly recommended tool to build a many unique articles for our internet marketing world. At the first time, I already see about another great spinner tools, but it is not free. And fortunately for me, I found spinnerchief. The free tools which have almost the same quality with another cost spinner tools. I already use spinnerchief to build many articles to attract traffics for my below minisite"