Rich Northerners actually. Just kidding. I really liked the atmosphere. UR was actually like middle of the pack for me in the rankings game compared to other places I applied, but after my visit it shot up to top two (W&M is #1). The students were VERY friendly. I would randomly stop kids in the hall and ask questions and they were very enthusiastic about the school and more than willing to help out. I didn't sense that feeling of cut throat competition at all.
As for the whole campus, most of the students are well off financial, well, at least their parents are. However, I have a hard time seeing the snobby rich attitude that you would expect. I've been spending time there, visiting my sister-in-law and going back with alumni I've met, and the people just don't come across as snobby or anything. And most students appear to be from the North actually, Jersey, PA, etc.
The atmosphere though is freindly, open, and warm. I walked on campus and immediately felt at "home." I figure where one goes to law school will consume the next 3 years of your life, so you want to go to a place that will feel like a home away from home, and UR was definitely that. The faculty and staff is very friendly and encourage that atmosphere. I think you would be hard pressed to find someone who doesn't like the atmosphere there.