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.

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.
People, I’m pretty sure over half of the articles you read nowadays come out from a spinner such as this one, and you can’t even tell the difference… believe me I know – I publish a lot of these articles myself, using Spin Rewriter, and they are very good and believable, you wouldn’t know the difference between one of them and an article written by a human.
Other article spinners also require that you enter your own custom synonyms manually or individually approve lists of potential synonyms as they are presented to you. This is another way of expecting you to do most of thinking, as opposed to expecting the software to be smart enough to instantly make judgment calls for you. Thus, one of Spinbot's main goals is to make the article spinning process as quick and painless as possible. 
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