I actually joined MOZ purely because I was following the QA reading the new topics each night for a few weeks. That was what convinced me to join. I have come across so many problems with MOZ and honestly still do not have any idea what I am really doing but I can post in QA which is good.

The on-Page grader is my favourite tool for a beginner like myself. But I am hoping in time they fix the issues I have found and I am sure there will be plenty more out there worth me taking up the $99 a month. (Fingers Crossed)