I just received my Defender Case and having the oil slick issue others have reported.
Seems to go away when the dock port cover is removed.
And this case makes the ipad heavy, wondering if i should have gotten the commuter instead.
I will a new tread to ask other who have both which one they prefer using.
I had the oil slick issue as well. I tried two different Defender cases. In the end Otterbox sent me a commuter case and will contact me when the Defender series is fixed to address this issue. When it is fixed I am going to send back the commuter for the defender.
I much prefer the defender over the commuter just because I travel a lot and need the extra protection that the defender series gives.