Its guaranteed that this tool will make rewriting jobs a lot easier than before because you can finally take a rest and let the software do the job for you. This is a wonderful tool indeed, and rest assured that everything will be perfect as long as you only use this tool for the sake of rewriting articles and not for changing a content thats the same as the article that you need to write and not rewrite. Expect that you will be able to make things a lot unique for the rewrites that you do with the aid of this tool because you now know how big its database is.
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.
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.
X-Spinner has super-advanced functions such as auto-grammar fix, for example it will correct "a apple" to "an apple," plus it can spin "I want to eat the apple, orange and banana" to "I want to eat the banana, orange and apple." We can't list all functions here, there are too many to list! - But one thing is sure, X-Spinner will give you the best rewritten article - no other spinner can do what X-Spinner does!