I’m sorry you feel that way about my participation in the discussion and defending editors of similar background to myself from what I considered unwarranted disparagement. Perhaps the only approach that would have 100% proof against accusations of “trolling” would have been to allow the claims to stand unchallenged, but that did not seem fair to people who come here to get useful information.
The result will be a very clean and much improved manuscript, but with lots of comments and suggestions, which will probably require some rewriting and extra work on your part. Getting back a heavily edited manuscript like this can be challenging, but know that it will drastically improve your writing skills and help you identify your weaknesses. During the revision process, it’s possible to create new consistency issues, which is why we recommend a final proofread or at least some beta-readers to help finalize your manuscript.
#2. YOUR BEST BOOK: nearly every other copy editor or editing service focuses on the writing and the mistakes. They will improve the flow of the words and sentences, and they will make it better, but they won’t fix the major problems with content. Our editors have been trained in the Write Good BooksTM method to make sure your book is commercially sound and will resonate with your audience on a deeper level. For nonfiction we focus on branding, credibility, trust, so your readers will take action and see results. For fiction, we focus on universal story telling principles, plot structure, dramatic tension and suspense, and world-building. Because a clean book isn’t always a good book.
Regarding your last question, I know of no editor who gives a money-back guarantee for occasional errors that happen to slip through or for a different opinion by a later editor. I’m afraid such things are just the nature of the publishing beast. But by having a shorter portion edited first, you will get a decent feel for whether someone is the right editor for you, and will be able to be confident in his or her work on your entire book.