I graduated for U of C. Was very happy with the program. Probably read some 1200-1400 studies during the year. The PD teaches a lot and is very up to date with whats going on in the field. You have a continuity clinic once a week + another 3 half day clinics per week. We usually came in at 9 and were done by 3 pm most days... No research requirement but if you want to stay in academics its a great place with Gozal/Van Cauter and others there.
I dont know much about the other Chicago programs..