Previous reviewers pretty much covered it. I go through plenty of cases until I find the one I like (and I'm very picky!), and this is simply the best case you can buy for your HTC One (so nice, I actually bought both the grey and black ones)
This case is great. After watching some reviews on YouTube, I finally decided on this case and I am very happy with it. The material is different than any other case I have had before. It is a good mix between soft and hard protection as the case is snug on the phone, but you can tell that the material can absorb a good amount of shock. The case is also very thin. I was worried that the case would add too much bulk to my phone but it is incredibly thin for this kind of case. The added texture is nice too. Provides a good grip to the phone. Finally, the design on the back is nice looking. Glossy squares that create the music frequency design on the back are a nice touch that add some class to the case. Overall, I am very happy with this case as I usually go with feather cases.