Only small but verschmerzendes drawback: the lower section has no reinforcement and is only made of silicone. That seems a bit wobbly and not as well thought out. This can, however, probably because of the construction so do not change.
The shell increases the Iphone weight significantly, but can be by a good Iphone / hand feeling.
All in all, I put this envelope each Iphone5 owners absolutely fond of!