I personally love this one. It creates amazing content and is extremely affordable. We use a combination of WordAI and Spin Rewriter for our SEO projects, because these two are just an amazing combination. I think Spin Rewriter beats the “Standard Spinner” of WordAI in terms of quality and human readability, but loses to its “Turing Spinner”. So what we do is use the “Turing Spinner” for Tier 1 projects and then Spin Rewriter for the lower tiers. Sometimes we might switch them up, but it really depends a lot on the situation.
I've ranked websites in the past with spun content, and now they are still on #1 position of google. First year (2014) google found me because my spun was really bad, many paragraphs were just copied and my position drop from #2 to around #20 after a panda update. Later I cleaned all my text with better spun (I didn't buy any article!), my ranking went up again, and with more backlinks I reached #1 and it is still there