I got myself the envelope along with the Xperia Z1 Compact about 3 months ago and installed immediately. Unfortunately, it turned out that the plastic back of the Xperia Z1 Compact scratched despite the envelope on the sides. I would advise anyone who buys this envelope, highly recommend a protective film on the back of the phone to stick.
Furthermore, it has solved for ~ 2 months of the leather cover of the magnetic-hemoclips what can be addressed again with a little superglue though.
