The manual just tells about all the wonderful features. It does not explain how to access them. "Save as Mac Hosts File" produces a file with that name. Then what? At least an application like TextWrangler is able to update the actual hosts file, and this works.
So one is in effect paying for a list of proposed sites to add to the real hosts file, and you still need to use another application to actually do it.
If I've missed something, please explain and add to the manual!