I had the black gloss one before the Matte was available. Looked good when I first put it on. But it scratches very easily. I'm sure it'll scratch up a lot faster than the black plastic on the 3G, but at least it's not your iPhone?
I did get scratches on the bottom part of my silver bezel from removing the bottom piece to dock the phone (I docked the phone daily).
Overall, the case was pretty good but definitely overpriced. Should only be $25 tops, but InCase overcharges for everything they sell.