I previously had the appropriate case for the 4S, which was but a few weeks completely out. The reason was a very aggressive curvature in the case, which should probably serve the fit. The 4S was then literally chucked into the envelope, what the case but acknowledged within a shortest time with stress cracks and soon with a total loss.
This version, however - at least to me present - was less tight and ran well to get the iPhone without being scared, the plastic would burst / rupture. Even after 4 weeks now no cracks or splits.
The look was and still is of course already very pretty.