Back home in MN, my son and I love going to OPH. They have THE best omelettes and pancakes around and the service is always great. Same results at our visit to the OPH in Sioux Falls. I had eggs and bacon (note to the OPH's in MN - in SD you get 4 pieces of the delicious bacon, not 3!!) and great coffee. My son had eggs and hickory smoked ham, which he really liked.
The only negative was the hostess. We walked in, along with another couple, and she said "Just one moment please" and then proceeded to make a personal phone call to her mother. She also seated an elderly couple and when the lady asked her a question, the hostess said "Right here", pointed to the booth, and rolled her eyes. Very rude.
Great food, great service, horrible hostess.