Bought a pink bumper at my local apple store today and noticed it has a different feel to the black bumper I got in the free case program and the white bumper I bought at iPhone 4 launch. The pink one feels much stiffer around the edges and less grippy. Wondered if they changed from original ones? Anyone else notice this? Wonder if this stiffer material will resist picking up color. It also seems like it's a tighter fit compared to my white one which had so much give.