I was a bit disappointed when the lime green HTC 8X was only released for AT&T since I wanted to have a device with that color. The Grip for HTC One that STM Bags sent along is the lime one. They are available in red, blue, lime and black.
The polycarbonate material of the case doesn't add much weight or size to the HTC One. It is a hard shell case with soft touch outer feel. The back is ridged, thus validating the Grip name of the case. Once you place your HTC One into the car you will also find the bezel around the front is raised just a bit so that your display is protected when you set it down on a table.
I hate the silicone cover cases that collect dust and make it difficult to slip a phone in and out of my pocket. The Grip provides enough tactile feel to help me hold my One, but doesn't experience either of these problems seen on other cover-type cases.
The Grip covers the entire left side with a small opening on the right side for the volume buttons. The top and bottom are nearly completely open for access to all the buttons and ports. There is an opening in the back for the camera and flash as well. The HTC One is completely usable in the Grip case and nothing is compromised.
I am pleased with the lime color of the case and find it is attractive and stylish. The case is designed in Australia, but can be purchased from several online retailers in the US for $19.99. I personally prefer to shop at Amazon and use my Prime membership.