Original Accessories, unfortunately still not as factory

The Motorola Shell Cover in blue I have directly from Amazon, it judging by the elaborate packaging uniquely original Motorola accessories.
The reviews that have been written in front of me, so to are not quite agree on whether the cover is now gummed like the back that comes with the phone, or is smoother. The question I can now clearly answer: the shell cover is rubberized as well, however original Motorola. It summarizes thus noticeably less grip at the back than at the factory.
Apart from this difference (for me: downside) it brings the same accuracy and strength with how the supplied rear.
My envelope will now go back, because of original accessories to the appropriate price I expect the same grip. Those who still want to attach a protective cover over it, which can of course be no matter the grip. (Then I wonder, however, why the back exchange, if they disappear anyway in an envelope.)