I attended the University of Washington GPR a few years back. It's a rotation based GPR, meaning you will spend about either 6 or 12 weeks at a certain location.
The locations include an anesthesia rotation at the VA(you will learn how to place a lot of IVs and stand around during surgeries all day for about 6 weeks doing absolutely no dentistry).
You will have a pedo rotation at the center for pediatric dentistry where you will have an experience that includes doing a lot of recall exams, a minimum amount of restorative, a couple of SSCs if any, plus standing around during GA not doing many procedures.
There's a oral surgery rotation where you will stand in the OR for pretty much the whole day retracting tissue. If you're not in the OR you are completing pre-op exams to clear patients for surgery, again, very little general dentistry experience.
The VA rotation is decent, usually about a 12 week rotation that you will be doing restorative, fixed pros, removable.
The last rotation is at the hospital dentistry clinic or AGD clinic where you treat medically compromised patients. Decent experience that is about 12 weeks long. You have an endodontist that comes one day every other week that spends most her time chatting it up with the assistants and use K-files without gloves(better tactile sensation apparently?)
Finally you are on call at the UW emergency room for 1 full week every 7-8 weeks where you have to carry a pager around all the time and drop everything you're doing to go into the hospital to treat patients(yes, 24 hours a day with no DA to set up or clean up for you)
I may be missing a rotation but, bottom line is the UW GPR is great for anyone looking to improve their dentistry for about 24 weeks out of the whole year or if they are curious what it's like to stand in during surgeries in the OR.
Definitely better off not attending the GPR, you should consider yourself lucky if you don't get an interview so you don't waste your time and money.
If you really want to be in Seattle, I've heard great things about Swedish GPR and the VA program as well.
Hope this helps anyone looking to apply. I just hope someone doesn't waste a year like I did.