I didn't want to take up a lot of space with 3 large pics so hope this still shows thru clear. The top were taken right after I put the case on. The bottom 3 were taken moments ago, exactly 1 week later. I am a pencil pusher and my hands are typically clean. I place my phone in my pockets, and on clean surfaces. As you can see, oils, dirt (I'm assuming), etc have really darkened the edges and parts of the back.
This may not be typical. But I thought I'd share my experience. Aside from that I LOVE the case. But will likely switch due to the visuals.
http://img.tapatalk.com/d/13/09/29/za2ateqe.jpg