Since the shell is so thin it is of course not for geeeignet protect the iPhone against drops, but it protects against normal wear and tear such as scratches very well.
The only negative point is the cut-outs for the volume up / down buttons. The shell is there as thick as the buttons and they protrude thus no longer felt out. Now I must always look so I catch the buttons. The handling of the camera release button has deteriorated somewhat.