I got feedback also after I was waitlisted last year. Like the above poster, they mentioned weaknesses in my app that I was well aware of (like my MCAT), but also brought up something that I hadn't even thought was an issue (I had over 100 volunteer hours, but they were all at one place). In addition to helping me boost my app for the next year, seeking out their advance helped me in and of itself. I work with 3 docs that have spent time on the ad com at my state school. 2 of them asked if I had sought feedback from the school, because the school apparently keeps track of which applicants do so, and I was told that they use it as a sign of our dedication and continued interest in getting into their school the next time around. Obviously it may not be the same at every school, but it certainly can't hurt to try!