It may look good, but does it produce suggestions that you recognise as genuine improvements and do you get the feeling that it will continue to do so? Criticisms have been made of the feedback- one review said that some of the suggestions were misleading and incorrect, and some of the claims made on their site are certainly a bit extravagant and the column entitled Comparison Chart is preposterous. It cannot be that good, but if you're enjoying it and find it useful, then why not? But don't expect it to live up to its hype.
Student or Learner