The Core Cases aluminum slider is a sharp looking hard case for the iPhone 3G. Although the product is a little expensive, it's made of aluminum for strength and low weight. After using the Core Case for seven months, here are some observations.
When the aluminum slider case (brushed black) first came out of the box, I was impressed. Unlike some other hard cases, there's an EVA foam layer on the inside to protect the plastic back of the iPhone 3G from scratches. Installation was easy, just place the phone in the back, and slide the front down until the side tabs click into place.