So just finished my third book (dont worry mod's I know the rules, LOL), and this was the first time I had the cash to hire an actual professional editor. Its pretty amazing the difference that makes. My wife is an awesome proofreader and she worked hard on my manuscript before we sent it off to the editor. We though we were around 80-90% done with finding issues with the text. But wow, the things she did to the text. I do not know how to describe it? Smooth it out maybe? Most of it was simple stuff like changing word order in sentence, removing over used expressions, and addressing repetitive words. She did catch a couple minor story issues we missed. One was I had someone referring to one of the characters by a name the would not be know by for another six chapters.

Ops.
Over all I am very please with the difference this had made and it helps me see there really is a huge advantage to a professional edit. I knew it intellectually all along, but this makes it more real.
So this is my plug, go therefore and find an editor no matter how good you think you write!