You cannot have a writing and have it edited to perfection except someone else's do the editing because you can rarely point out your own writing mistakes in all ramification. Are you using reports or presentation to build your business or research? Can you afford to have your reputation crushed with mistakes in your writing which could have be avoided with just $5? Do you misplace "do not to don't. Would you like the luxury of your personal proofreader? I will correct: grammar (including grammatical concord), spellings, punctuation, syntax, typos, sentence structure, verb tense, and others for a token.