Great article and research, thanks so much. I was looking to speed up some of my content writing but these are pretty bad. All of them do awkward things that would require proof reading and replacing words and phrases to be published. This was a simple short story, very readable. Professional industries with inelastic terms and vocabulary would not fare well. Just this one paragraph felt like a lot of work to fix. I’ve heard a lot about spinners and SEO, but now I see that it would not work in a professional industry, unless I’m judging to quickly without trying them, let me know. I don’t see business or legal content doing well with these.

Only standard WordAI spinner showed 12% match for me in Copyscape which is very good I think. Also I will add that for SPAM links in general you don’t need any quality at all. if Google crawler can’t find connection with other spinned articles – goal achieved. Sorry, but I don’t see that with expensive spinners as Copyspace shows that in plain sight.
The content above is 98% unique according to Spin Rewriter and I really like it. It actually seems better than the WordAI spin – only the “Standard” one however, it is no match for the “Turing”. One thing that the spinner failed to recognize is the “green eyes” phrase where it replaced it with “environment-friendly”. Yea, I laughed too. Anyway, here is the spintax for those interested in more testing: 

"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"
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