The shell adapts to the body of Lumia 800 perfectly, the cutouts on the sides are also precisely so that the buttons and ports are accessible without any problems. The material is stable and makes a high quality impression, the Lumia 800 is well protected by the sheath in any case against falls from a low height and against wear and tear. The color looks just as strong as on the product image and looks really nice. My friend used the shell now for almost three months and the color at the corners dissolves slowly but surely, looking awkward, the protective function but not impaired. Still, I prefer this one star off because I think the noble look of expensive smartphones suffers not insignificantly by the black abrasion edges to the envelope.
Nevertheless, the actual purpose of the sleeve - to protect your phone from everyday hazards such as erosion and small falls - fully met, therefore four stars.
Short Summary
Per + Protection against everyday wear and lintels + Absolute precision fit + Perfect cutouts for buttons, ports and camera + No negative effect on the heat generated by prolonged usage
Contra - After only about three months of daily loading and wear the color dissolves in the most stressed points slightly. Function is not affected, but just looks ugly.