it's useful for people in a hurry but too expensive in my opinion. They should charge 30 % less of their current rates.
My text of 2500+ characters was checked for less than 2 minutes. Of course, the quality of such work was not superior. In fact, I only got commas checked and a word corrected from single to plural. The editor didn't even think of what the text was about. Maybe a thoughtful review costs more money. Maybe you need to have different plans then. I don't know. But as of now, the service is of no use when it comes to more or less important texts. Hope you'll improve it someday.