I bought the Premier version for 1 year. Good program but BEWARE. There is no subscription reminder provided by Grammarly as is common with other programs. I canceled the renewal on the first day after the new auto subscription took effect and it came to my attention, but monetary cancellation only takes effect at the end of the renewed year. And, so, I pay another $140 subscription fee I don't want with no refund recourse available. In my estimation this is an ill mannered way of squeezing more money out of customers. Providing top-notch support to customers insures loyalty, not such practice as this. I'm disappointed. You may have squeezed another $140 out of my pocket but I definitely would not go with the program again.
Update: in all fairness, after emailing Grammarly I was granted a full refund as a courtesy which is to their credit. However, such a situation can be easily avoided, making it easy for both parties if Grammarly would send out a renewal notification prior to the end of the current billing cycle to give a customer a heads-up to either renew or cancel.