Philly Country is one of my favorites out of all the best courses in the area. I've played it a handful of times for fun and for tournaments, and walked it in 2005 for the Am. The 17th is all-world; make sure to drop a ball by the Byron Nelson plaque in the fairway 200 yards out and TRY to hole it.
One thing I like about Philly Country are the short par 4 holes like 1, 2, 13, 16, and 18 where hitting driver isn't always a terrible option. While courses like Pine Valley and Merion take driver out of the good player's hands on some holes with their sand and penal rough, Philly Country allows the player to swing away and seek birdies instead of avoiding birdies. While this definitely makes it an easier course to play, I find it more a lot more fun and interesting.