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. 

Finest spinner in the market today and more for me because saves a lot of my time... Earlier i have used the best spinner but this spinner is 10 times better faster, easy to use, and articles make more sense, unique, also helps in preparing new articles and spins same article into hundred of more articles for back-linking, etc. 2 thumbs-up... simple and easy to use...
These days there are a lot of article rewriting softwares and it is pretty hard to choose one that will suit all your needs (quality + price – no subscription at least). When you will look for example at WordAI article spinner – you will notice that there is pretty expensive subscription (50 dollars per month) while spinnerchief costs only 77 dollars per year (which is about $6.5 per month).
4. Tier 2 content (content that is keyword rich and relevant to your niche. Doesn’t have to be all that readable, it just has to be indexable by a search engine.)– Here put same options as with the Tier 1 content situation with the only difference that you set the 1st input to “Regular.” It is important that lower tiers have a lower quality of content compared to upper tiers.
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