Have done "The Knob" a bunch of times, as my girlfriend used to live about 2 miles from the trailhead near Lizard Creek. There's some great views of the Lehigh Valley... too bad there is so much graffiti.
We took the longer, more scenic rout northbound on the AT from PA 309. I led an ODC trip that day. We had beautiful weather and a total blast. The Knife's Edge and Bear Rocks were especially memorable, but the perch at Bake Oven Knob is a real autumn treat.
I only lived in this part of the country for 18 months, but wish I had visited more of the mountain summits while I was there.