The attachment of shells is really a bad fumble - that take them from without damaging an art. It maintains good grip on Macbook. However, it will no longer close 100% by the small retaining clips. The gap is only minimal. Do not think that it could get through the to appreciable contamination by dust.
For those where place value on it: The Apple shine through subtly.
But the major shortcoming:
The 2014er Macbook Air 11 has small openings on the side 2 microphone. The older model years probably only one.
With the cover are both covered. So it is absolutely unfit for the 2014er, if you want or use Skype so. On selling photos on Amazon it is displayed differently. Here the two microphone openings are free. Obviously there are different versions?
So: quality seems useful. Mounting defiziel - Dismantling without damage almost impossible. Only 2 stars, because there are obviously different versions, which are not necessarily compatible with the 2014er.