Brittle plastic hard shell

Color and shape are ok. The device fits very snugly into the sleeve. It lies with shell good in my (large) hand. The shutdown / Einschlatung when closing / opening the lid does.
But what is bad and Grote leads to my devaluation, is extremely brittle plastic material around the unit (not the hinged lid, which is okay).
Two corners broke out after only 3 months with no apparent cause, after 4 months broke the thin holder of lateral magnetic clips that I still could fix with superglue Weider fortunately.
As a pure decoration envelope like that some will begin, a protective effect can not develop this shell material.
No recommendation.