Luck with RG
My friend queried Russ Galen, and she not only got a reply quickly -- she got a request for her to e-mail (yes, e-mail) the first hundred pages or so. She did. In a matter of days, RG asked her for the entire MS, again via e-mail. My friend sent it. Within about a week, RG sent her a detailed rejection, highlighting where he thought her story went stray. My friend disagreed with him, and for the next few days, they exchanged about four e-mails back and forth, trying to find a common ground. That didn't happen, and RG wished her luck -- and said that if she didn't find an agent, he would be very happy to look at her full MS, if she made the revisions he recommended. Well, a few weeks later, my friend signed with Don Maass, who didn't ask for any revisions. RG got in touch with my friend to ask how the agent hunt was going, and she told him that she signed with Don.
All in all, he was very responsive...to an author whose work he was very interested in.
Me, I'm still waiting for my rejection from him, after... (counts) a few months for the latest query, nearly a year from my previous query.