worth buying official ...

No complaints about the design, this is the best I had shell on smartphone. Perfect fit, true volume and ignition buttons, where other case offers just a bulge ... When you press the corners, one feels that there is a slight gap between the shell and the phone that allow the hull bend without touching the phone in case of shock ... So very very well studied ....
Just two criticisms: I liked the hull is more slip, especially the back is rigid and smooth; the sides are "aggripants" and allow still not to escape easily. Also, the inscription on the back is a little bling bling and too visible for my taste ...
In the end, great product that I recommend.