I have used it and found it helpful... bought the M/F test and it led us to the doc for further testing. put my mind at ease though. Found out H had a mild infection and needed antibiotics and now has a thumbs up test.
Just depends on your needs. If you are just starting trying, then it may be a way for you to mentally relax and not worry about the "am I this... am I that's". I found I got way too wrapped up in research and and then couldn't relax -- I diagnosed myself with all sorts of fertility issues (which, we know at my age is common concern!).
Keep a level head and if your gut says you need to test, take it and move on from there.