I'm rather good, and if needed, have another two professional proofreaders/editors to double-check the work. If the topic is of interest to me, for example literature or history, I can provide feedback on content as well as style (as can my colleagues).
I have roughly 20 years experience in writing and editing with a grounding in print media. My work has spanned traditional and online publication including media releases, marketing collateral, fiction and non fiction, internal communications, web content, funder submissions, policy and procedure manuals and grant applications.