In anticipation of Apple beginning to give out free bumpers this week, I was wondering if I could getting any feedback from already owners on them. I am looking at getting either the black or white and pairing it with a carbon fiber skin. However, in reading some posts people are saying the material of the black bumper is different from the others (much more rubbery). I am unsure of which way to go because I carry my phone in my pocket and do not want to get a case that is difficult to slide in and out of my pocket. What are your experiences with the bumpers (specifically black and white)?