Good for proofreading but not for elevating your writing (PaperTrue)
I would give them between 3 and 3.5 stars. I have used this editing service twice. I think they did an ok job. They checked your grammar and reformatted your paper for you, but there is not much feedback on the word choice, or the sentence structure. Last time, I sent them a cover letter of around 650 words and they only changed like 8 words and charged me for $33. They do delivery on time. Keep looking if you are looking for editors who will elevate your writing.