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Simply put, it doesn't work. It is easy to connect different services, but you can only copy over the folder structure; nothing inside the folders will copy. Whether you choose backup or transfer or sync, you will only get empty folders. Support isn't available; they will refund your money, which is greatly appreciated, but don't try to help solve the issue. That tells me that its hit or miss and often doesnt work.
Grammarly used to be a powerful tool, but it has steadily declined to the point that better options exist. For one, the interface is far too intrusive; having a small circle hover over and block your work is never acceptable. For two, it does not work on more and more websites...why pay for a tool that doesn't work when editing your blog? Finally, customer support is nonexistent. You can only submit an email, and response time is weeks if you get one at all.