Otherwise the envelope now lasts me about half a year and has also been some falls for example survive on laminate and tiled floor (the iPhone thankfully also). During his last fall it lost a small top left corner on the high / low volume control, but sitting still good and is fully functional.
For such a low-priced product, I am so far quite satisfied with his life and quality. If the hardcase eventually completely gives up the ghost, I'll probably buy again ours.