This case is amazing. It does make the 3G a little bulkier (you dont notice it untill you take the cover off again).
The headphone socket is a little bit harder to get to. For most headphones, this isnt a problem, and for the iPhone headphones, its fine. But if you have one of those chunky 3.5" cables running to a HiFi, you have to take the top part of the case off.
Maybe the damage was because I was constantly taking the top part off to run the 'pod through my HiFi. just where the holes are for the volume/hold buton, the plastic of the case must have been rubbing against the iPhones casing, and created a couple of rather deep scratches which removed the glossy finish of the phone. This meant it couldnt be cleaned out.
Apart from that, amazing!