Use the envelope for several weeks and am totally happy with it. The quality is really very good, no cheap plastic. Properly matching and stable. Also looks pretty good, makes the HTC Sensation XL even a little bit more beautiful from behind :-). Now after several weeks really intensive use, the mat instead of the shell has become even minimally matter. Anders is plastic, however, can not act, after all, I take my smartphone with the work and put it there on the courts, shall we say, not as clean :-). Under such stress, the casing has just fought magnificently and still looks very good.
I definitely recommend buying this product! The 10 are well laid out here in any case.