Ouch! It's painful to see this only after days of use, Apple advertised it as their premium leather case, really? $40 will get you 3rd party case that offers 10 times more quality and durability, just look around. Shame... I learned this from buying official bumper case for my iPhone 4, like in white and blue which turned grimy very quickly and lost their appeal.
This one only imitates the feel of leather and does not offer any quality whatsoever. I'd seriously consider getting something from Speck or just any bumper case on Amazon would do just fine if you like the look of the iPhone and don't wanna cover it up entirely.