Google is getting VERY good at catching spun content so you'd better be talented at manual spins. If they DO catch you, of course they'll spank you... and hard. So anything you use spun content on is inherently AT RISK. Worse yet... Google gets better at finding spun/poor content every year. So in the longrun you're screwed. I'd weight your other options and see if you couldn't find a cheaper source for manually hand written content.
October 5th, 2018 (Friday at midnight, 11:59 PM PDT): SCARCITY — During the weekend we'll be removing some of the exclusive launch bonuses from the bundle. Friday is the perfect time to make sure that potential buyers are going crazy about making sure they get full access to Spin Rewriter PLUS all of the cool launch bonuses — this mid-launch scarcity is going to bring in a flood of extra signups for you!
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.