Is the design of the Sony Xperia Z1 is a good compromise

The shell looks quite chic and can be mounted easily. Yet it sits so far (I use the shell for about 4 weeks) sufficient 'tight' without the instrument by 'suffering'.
Since the envelope only the back and the edge of the smartphone covers, the total thickness remains low and the 'thin' feel of the Xperia Z1 remains largely intact.
The disadvantage remains to mention that the 'optics Carbon' the back is of course only GE-faked and feels quite smooth. This 'misses' the phone like something through. For 1 star deduction.