Spin Rewriter 9 rewrites content on paragraph, word and sentence level. It also turns sentences around and makes sure that only appropriate synonyms are used. Aaron added a special ARTICLE GENERATING ALGORITHM to Spin Rewriter 9.0. This algorithm makes sure that the generated articles are even more unique, and even more readable — if that was even possible!
I've ranked websites in the past with spun content, and now they are still on #1 position of google. First year (2014) google found me because my spun was really bad, many paragraphs were just copied and my position drop from #2 to around #20 after a panda update. Later I cleaned all my text with better spun (I didn't buy any article!), my ranking went up again, and with more backlinks I reached #1 and it is still there