The Mumbi shell I use mainly for outdoor activities, such as when the phone while cycling in the saddlebag or backpack is housed. Combined with a screen protector is it really well protected from scratches and bumps. The cover fits perfectly, the cutouts and button areas are all in the right place. Also the magnetic charging port can be used with an appropriate cable, but to use the original Sony dock they must be removed. Further to mention is positive that the envelope does not stand out much. The silicone edges are on the side of the display about so that should remain intact during a crash with the display facing down the display (if not just a stone at the site located). In summary: does what it should, nothing to complain about!