I have the Pdair black aluminium case on my phone. The quality is very good. When holding n900 in hand with the case on it feels more solid an robust. When loking for a case my first priority was that I could answer a cal without needing to open any lid. This case could provide that. Then it has a good lay on the table design. It ads more bulk to the device, but that's expected whit thise type of cases. It defenetly protects from scratches and protects in a case where device is droped on hard surfaces.