So I am currently writing/spinning my content for my tier 1s. Some of them are hand-written and some are spun due to laziness tbh.. The reason why I spin some is because they appear as 100% unique with this free tool http://smallseotools.com/plagiarism-checker/ which some say is quite good. These articles are poorly spun in my opinion but still is 100% unique according to this tool. So I am wondering how much I really should rely on this. What's you experience using this tool? Will it pass Google crawlers?