I know this is more for the treader system, which you aren't really updating, but I thought it would be nice if you could add a way for people to view the feedback that a user has left for others as well. They way if for some reason user a leaves feedback for user b, but user b doesn't leave any feedback back. If you are at user a's profile then you could see not only the feedback user a has received, but the feedback user a has left for others.
I hope this makes sense and is something you can consider to help make the whole classifieds experience better. Thanks!