The company gives a free version for its software through that you can try few of its features and also give $7 trials for its ultimate versions. You can test the software and the go for longer terms. There is no money back policy as the company use and buy, which I think is fair in the case where they give trail for just $7. For support I will say is a good company they update and help us to get the solutions. The company has tutorials and videos which also help us to get best out of software.
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.
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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