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.
In this day and age, it is by far the one of the hardest tasks to do online always coming up with fresh content for Google to devour. I love how easy Spin Re-Writer makes it for online marketers to get on with their business and not have to worry about the big G penalising their sites. Of course it's not just about fresh content, but it is certainly a big factor. Thanks Aaron and the team...:)
SpinnerChief works in a similar way by polling its huge Cloud Thesaurus for the statistically best synonym. As the Cloud Thesaurus grows, so it gets better and better at synonym replacement. The cloud thesaurus supports more than 20 languages, including German, French, Spanish, Italian, Swedish and Portuguese (both Brazil and Portugal), Dutch, Indonesian, Greek, etc...
Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.