Spin Rewriter 9.0 is available exclusively on their website from the 4th October 2018. If you test drive their software for free before the 4th Ocboter 2018 you will be testing version 8.0. Get a free consultation to see how the Spin Rewriter 9.0 can work for you. Their professionals are there to assist you with your article rewriting questions and concerns.
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.
Think of it this way: What do you have more chance of hitting, a distant, tiny target or the broad side of a barn? For the sake of search engine optimization, you want your website to be the broad side of barn. The more quality articles, or unique readable content, your website or blog offers to search engines (and therefore the general public) the more exposure your website will receive from major search engines.