To Cover: It surrounds the HTC Desire HD perfectly, the recesses sit at 100% at the right place. I had ordered the envelope because my HTC Desire would ever slipped almost out of hand, because it's slim and particularly smooth. With the "Tire" (see also funny out) can not be guaranteed to happen. The HTC is now a very good grip and is comfortable to hold. And if you have stuck to the charging station, the HTC, you can cloak the previously off easily and put back afterwards. It is not worn out and it is, I believe, may not happen as quickly.
One advantage for me is still that the volume control button is now hidden on the left side and one a little bit resistant to press on than without covering. Before that, I am, when I held the HTC in hand, very often unwittingly come to this key, which I found very annoying.
TOP, I like it well, and I can really recommend the article. Good merchandise at a reasonable price.