Bought at Media Markt after I made rather a bad experience with the cheap products of this Case. The Case looks great with value and feels like that. The Tablet fits in 100% and also sits bombproof inside. All important functions, such as a set-up function, and even an auto-wakeup function (goes out when it closes and if you open it) are available. The case itself is super flat and makes the tablet not unnecessarily thick.
Thus, it fulfills my understanding all the important features that should satisfy a Case.
Conclusion: as so often, rather spend a little more, but get decent quality.
PS: What was used for material, I can not say exactly - feels like a kind of plastic and has a relatively smooth surface.