Here's a pic of the "lip", I noticed the lip as soon as I bought the case because it was a little uneven and rough to the touch, however it has smoothed out a lot with everyday usage, and the top is really the only place it was uneven, the rest of the case lip is pretty smooth.
I really believe this case to be next to perfect. I had my first successful drop test, and it passed with flying colors, no damage to iPhone OR case, and it was a good 4-5 foot drop on concrete.
This case material is exactly what I was looking for, I wanted to move away from the silicone/rubber cases to a hard type case but something that was easy to take on and off, the NGP is the perfect hybrid of hard and soft cases.