I'm still completing my education, and I'd heard that it was helpful. For context, I do a lot of creative writing spanning various styles and languages. I can't put it into multiple languages at once, so when I had a novella that had most of its dialogue in German, Grammarly kept changing it. Just in this review alone, it's been trying to change things that are perfectly fine. There are features that might be useful, but they're part of the overpriced premium plan. I'm not paying that, plus tuition for my formal English teacher. The tones are also hilariously bad; I'm currently "sad." The algorithm doesn't understand commas and enjoys trying to put "the" in front of every single noun. If I were to actually use most of its suggestions, it would look like I'd Google Translated some sentences from my rudimentary Italian practice.
I understand how difficult it is to get everything right, but these errors are so bad that they'd be almost funny if I wasn't so angry with this product. So many of my peers use it to assist in their writing, so I assumed that it would be a good addition to my desktop. It was not. I think that this is marketed as some sort of resumé-writing genius machine, but functions more like a substitute math instructor trying to teach English. I can tell this partially from the fact that I have a seething case of writer's block and only wrote 14,002 words last week but still managed to be more productive than 92% of users. This should be aimed instead toward students looking for a cheap hack to get caught using a bad spell check.