Wow. I am using your 7-day trial to edit my novel and I am very impressed!
I tried several applications (Word 2010, Whitesmoke, etc.) to get my book ready for publication, yet none of them worked even half as well as your product. Your system caught things that Word and Whitesmoke completely missed.
I am estimating about at most two months worth of editing time. As such, I have found Grammarly not only better, but much cheaper than the alternatives.