I paid for premium during writing of my diploma thesis and it was decent but certainly not worth the money, it is after all a glorified spell check. However what I am the most displeased about is that I have been unsuccesfully trying to quit the premium for three months now. Eventhough I cancelled my subscription (and got the confirmation email) I had to contact the customer support next month because I was charged again. Customer support let me know that it is definitely my fault but AS A COURTESY, they will refund me (which thanks to the exchange rates and bank fees still cost me money) and they will cancel the subscription for me. Surprise surprise this month I am charged again. I wonder when this will end.