The material is relatively thin, the stress caused by the key holding stood. However, the insertion of the (well-stocked) cases in the front pocket of a mediocre tight jeans is given its softness and its "flexibility" often not so simple - that would work better with a thicker material.
Optical wear there yet: The dye is apparently not very resistant, so that after a few weeks over the whole surface spread many small light gray spots have formed. But this not bother me much.
After about half a year of use was in the separation "wall" between the main and outer pocket a big hole, as these (as well as many other key pocket) consists only of very thin material. In addition, recently the slide of the zipper of the main compartment adopted.
I am particularly happy about the thing, therefore, no longer, thanks to the very niederigen price but you can possibly every six months afford a new one.