No personal experience with him, but here's a link to a blog post featuring one of his clients:
An agent working with their client free of charge to help improve their book is not an "added benefit."
It is an added benefit, if you consider that some agents do not spend time with their clients developing their project into a better book. Some offer little or no editing at all.
Beating a dead horse here, but . . .I'm sorry, what I was trying to emphasize was that doing it "at no charge" is not an added benefit.