Other article spinners also require that you enter your own custom synonyms manually or individually approve lists of potential synonyms as they are presented to you. This is another way of expecting you to do most of thinking, as opposed to expecting the software to be smart enough to instantly make judgment calls for you. Thus, one of Spinbot's main goals is to make the article spinning process as quick and painless as possible.
Aaron has just closed out a very profitable 5-figure promo for one of my products, and I've had the pleasure of also promoting him. Now what I'll say about Aaron is, he puts 110% in absolutely everything that he does. If you have an opportunity to jump on one of his launches or promote one of his products or just work with him, I highly recommend that you do so.
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.