It is very easy to use and understand. I like the fact that it checks the website against Google's guidelines. It also helps me improve my websites by telling me what I need to do to improve each page. The only downside is that sometimes there are errors with images or CSS files causing it to fail. Sometimes the error will not let you know where in the file the problem is at. Make sure to read checkbot's FAQs before using it as they have some great tips for making sure your sites work perfectly! I am able to find out if my websites are following Google's standards which has been a big help for my practice.