For shell: I have other cases Bingsale TPU Skin Case Nokia Lumia 920 Silicone Case Cover - Silicone Protector Cover Yellow tested, made of silicone. Considerably thicker and perhaps even falling more secure, but also very ignoble in optics. Wavy edge. Make the phone thicker as the Jungle use. That seemed too far away from the endeavor of the mobile phone manufacturer that is flat quality and finally the thing is also a commodity. Which reminded me of old bumper cladding on Ami-cars in the '80s. Where: A really saved the phone when it occurred to me directly from his shirt pocket while tying shoe on the stone on which I placed my foot. If this envelope which also managed? I think so. Because it does not come so much to the mitigation of impacts on the electronics (which can the phone), special care to avoid injuries through the optical direct action on the cell phone. And as it comes to the look: In this envelope the phone looks hardly different than without. The cutouts for the side buttons could sit a little deeper, however: you can see the buttons on the right side so that even better sensing than without. And: The mobile phone is safe in their hands. The back is slightly roughened. My wife took the phone without a cover noble in your hand. I think it feels without, like a bar of soap. With the envelope: a safe feeling. I miss my hand strap of the Nokia N97, you can no longer fix here, not at all. In addition, there are no scratches on the back.
Conclusion: an ideal compromise of look, feel and protection. Hence (despite redundant protective film) 5 stars.