If you consider that you can spin articles with Search Engine Optimization (SEO) in mind it definitely makes Spin Rewriter 9.0 worth the money.  Your articles will now be able to rank in Google for your keywords you want to rank for.  The more content you can produce and put on your website the quicker Google will rank you.  This allows you to quickly create scalable evergreen content that will rank for years.
Not sure about version 1, but I'm testing version 2 right now and I have to say it's the best auto spinner I've seen bar none. The content is actually extremely readable and probably better than the manual spins a lot of people do out there. However, some of the content doesn't pass copyscape so make sure you play around with the settings. Minor edits should do the trick. I'm on the trial now but seriously thinking of keeping the Turing plan for my Tier 1 content.
WordAI is probably the most famous content spinning service. Many people swear by it and the quality of the content it produces and it is not empty talk. But let’s see how it will spin my short story. WordAI has two modes of spinning – “Standard” and “Turing”, with the latter being the one that produces better results. I will spin the text with both of them.

There are a wide range of applications that might benefit from the content rewriting capabilities of ArticleRewriterTool. The obvious applications include building content for your website or blog. Other applications include any kind of essay or creative writing (virtual or not), twitter, newsfeeds, Craigslist posts or even paid article writing services.

Anyone can do this, all you need is a computer and the ability to string a sentence together. You can write original articles and submit them to article directories and get paid. You have to apply to these sites and may or may not get turned down. If you should happen to get turned down then just keep plugging away until you find someone to "hire" you.
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...

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"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"