I don't use homefeedback.com, I email the agent directly. I email first, and if I don't get a reply, I call the office and leave a message on voice mail.
My third attempt will be to an agent cell phone. At that, I know they have ignored my first attempts, and I am apologetic about bothering them on their cell, and explain that I am real need of help w/ feedback and thank them for their understanding about my persistence.
I take the email route first in approach, and I know it is the route to which I am most responsive. If you catch me on the phone and I am in the middle of something, I am likely to say, "the kitchen is too dated for them" politely, but briefly, so I can get back to my own agenda. With email, I will take the time to write out more info that will help the lisitng agent with their seller.
I have found the same works in reverse. I get more responses via email, and more detailed feedback.
I am curious to know if there is a difference in responses based on geography. Since I am on the east coast, just outside of NY, would that make a difference?