Quality degradation against Reflex Case for iPhone 4 (s) - not suitable for seat pocket carrier, good for shirt pocket transporters

I have the envelope (green-blue) now 4 months. The phone is much less scratch as yet at the Hard Case for iPhone 4 (S), but unfortunately are also some other details quite differently.
The rubber compound is apparently softer, at least, the abrasion resistance is significantly worse. The iphone4 case I had less than a year, no damage, very little wear at the corners. With the same use (seat pocket) in this envelope the corners are so worn after 4 months that the plastic see through. In addition, the plastic frame is broken next to the headphone jack.

Generally, you can tell by the feel and fit of the half-shells to each other, that was pretty saved here ...: - /
And I was looking for the experience of Reflex iphone4 shell quite a lot of the series.

When my friend the shell keeps perfectly so far. She has the phone but usually not in the back pocket there.