The most interesting thing about this tool is that it has an option to add your website in its database which helps you get more traffic from search engines. It's free so there no harm if you try it once or twice for getting some idea about how useful it can be. Nothing specific I dislike but sometimes when I am trying to check my site through this tool I find that it takes too much time as compared to other tools like Google Webmaster Tools etc. If someone wants to test their sites they should definitely give it a go because it will only take few minutes to understand what kind of data it gives out. Using curiouscheck I found that the link building process was very easy with this tool.