Use the cover with my black Lumia. Can only agree with the previous speaker, the shell fits perfectly, even with the side buttons. The keys include approximately flush with the cover, but are handled very easily and by two notches to the right also be felt. The cover increases the length, width and thickness of Lumias by about 2 mm, falls in a same color not at first glance.
Another advantage is that the mobile phone with winter gloves is now much grip and not as smooth as the naked 920 is.