I started to use grammarly in the middle of August 2018. Using free account, I feel quite satisfied with the feature that it provide. It is really help me writing business email, since i am not english native. Then I was tempted to use premium membership in expectation that the premium will bring much more special feature that the free doesnt.
So I purchase it, in Sept 2018 for Annual plan, considering the fee per month is the cheapest. And that was my biggest mistake of the year, I was really disappointed. There is only small different between what i got from free compared to premium one. I was expecting soo much of it.