Without getting into specifics on my actual experience (which was quite negative) I will say that their resolution process does not work. Their patient advocates are only interested in proving the hospital right, and even if you're lucky enough to get through to someone who matters - they'll probably do to you what they did to me: have their lawyers call you.
They would't even listen to me. It went straight to lawyer. That should tell you something about how confident they feel about the care they provide.