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.
This is definitely one of the better options among the spinners that we have available right now, with great customer support – which I had a pleasure of dealing with, they were helpful and fast to respond. Actually the whole team behind this product is very professional, I know a couple of them and dealt with them in the past, they an alright bunch.
Yea mate, WordAI really is overpriced IMO too, which is why I didn’t rank it higher in the cost-effectiveness rankings. Now, it did change more than a few words, but I see how you would think it’s less than 80% unique. TBS is also great, but only in terms of functionality and the easy interface which allows manual spinning to be done quite fast. As for their thesaurus, I think they have a lot to improve.
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...:)

Our browser made a total of 48 requests to load all elements on the main page. We found that 73% of them (35 requests) were addressed to the original Spinnerchief.com, 23% (11 requests) were made to Whitehatbox.com and 2% (1 request) were made to Js.users.51.la. The less responsive or slowest element that took the longest time to load (2 sec) belongs to the original domain Spinnerchief.com. 

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. 
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