I just got this case too, not 100% sure how I feel about it yet. The hard plastic is a little slippery, but I like the way it feels. There is some space on mine between the glass and the piece that covers the buttons at the bottom of the phone, dust will inevitably get in there, but hopefully not too much. I had the Incipio Double Cover case, but got the Otterbox primarily because the ports are covered. From past experience it seems that dust going into ports almost always results in a few specks making their way under the screen, so covered ports I like a lot, and the port covers are perfectly aligned...no issues with the flaps opening on their own. My biggest complaint is that it does make the volume and power buttons harder to activate whereas the Incipio case seems to make them easier to press...it's not as easy to one-hand it. Overall though I think i'm going to hold onto it.
The OP had suggested to wash the inner silicone layer with dish soap as it lessens lint collection and it definitely does help!