Overall, I would say that it was most useful when it was pointing out things like passive voice or cliches, and less useful when telling me to replace relatively simple words or phrases with even simpler ones. Some of the words were things like: "feedback", "solicit", "desire", etc. We could certainly replace these with "opinion", "ask for", and "want", but some of the meaning and nuance is lost, especially given the context.
I may not be the most eloquent writer, but I'm not writing for a group of 4th-graders. The "dumbing down" of language leads to dumbing down of thought in the long run.