I'm surprised there isn't any reviews here about PP. They have two offices, one in Mesa and one in Gilbert. I've never visited the Mesa office so I can't rate that one.
Dr. Ciminello is hands down the best doctor in all of Arizona. We recently had our first son and of course had lots of questions. He took the time answered all of them, didn't make us feel retarded or rushed. PP has two other doctors, however we haven't used them, so I can't comment but I highly suggest Dr. Ciminello for all of your babies needs!
EDIT: As of May of 2012, Dr. Ciminello left and went to Desert Shores Pediatrics. We tried to stay with PP but the quality went down over the past few months, therefore I've changed my rating from 5 to 3.... We ended up switching over to Desert Shores to continue going to Ciminello and have been happy.