The instant article spinner or paraphrasing tool carefully scans the article you enter, looking for all the words that it can replace with synonyms. All the words or phrases that will be replaced are colorfully highlighted to make them prominent and easy to identify. By clicking on each of the highlighted text, you can see the original word along with other suggestions, and you also have an option to add your own word. To restore the original text, just click the original word.
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