Excellent gel cover, fits perfectly and very easy to slip onto the phone. This one is translucent and black/smokey in colour so it looks really nice on the DesireHD Chocolate. As it's a large phone it can be a little cumbersome to hold and it can easily slip out of your hand (I nearly dropped mine several times in the first few days before I fitted this cover) but this makes it feel far more secure. It also means you can stand the phone on its edge leaning on something without it sliding/falling over, which makes it easier to see the screen or notification light at a glance or watch video etc rather than it lying down.
One bit of advice.... I bought this in tandem with the 2 other items in the "frequently bought together" suggested items (this cover, 5 screen protectors HTC Desire HD Screen Protector (PACK OF 5)
(very good if a little fiddly to put on) and a leather HTC pouch HTC Desire HD ACE Pouch PO S550
(also a really nice item that the phone fits perfectly), but even though this gel cover is very slim, with it on, the phone is just a tiny bit too big to go into the leather pouch, which is a shame as it would have been just a little extra protection for the screen when not in use. I'd say you can either use the gel cover OR the HTC case but not both at the same time.