Hi-
I did my GPR at Westchester Medical Center last year. Overall, it is a great program- the only downside is the call. Call is in-house, every 3rd-5th night. When you're on call, you're oral surgery, and cover all facial trauma half the time (lots of lacerations), and have to manage inpatients (OMFS 2nd calls will come in in the beginning when you're learning, but really expect you to do most things yourself). You're working more weekends than not.
Besides that, it's a great dental experience, esp if you want to do general dentistry (I'm doing pedo now so don't get to use a lot of what I learned). We did a lot of everything. You restore a ton of implants, even full-mouth roundhouse implant bridges. More endo than you'll ever want to do. There's one attending who comes in just for fancy esthetic cases (crowns, veneers, bonding), and a few attendings that do advanced prosthodontics with you. I did a good number of perio surgeries. One morning a week is pedo. Once or twice a month you see special needs patients in the OR for comprehensive cases. And of course, lots of oral surgery- mainly extractions, but I did an apico, reduced a ZMC fracture in the OR, etc. The attendings are all volunteer (i.e. want to be there and teach) and don't have their own patient schedules, so they're very available. And the program director (Dr. Martinez) is quite possibly one of the nicest people.
Hope this helps- let me know if you have any more questions.