I don't know! PaperTrue is cheap in comparison with other professional editor consultants. I have choosed it because I wanted to give it a try and because I needed proofreading and academic editing. The result makes me say "ok. So?" There are some inaccuracies left regarding quotes in the text, they weren't coherent through the text, and still, they are not. I was expecting annotations on words use and advice for new and appropriate terms, but there are not. The formatting part is perfect. PaperTrue delivered it one day earlier. I don't know if I will use it again.