The Razer mouse range has been designed with gamers in mind; it is stylish, comfortable to use, and has accessible, customisable buttons. The mouse itself is fairly large (about five inches in length, two-and-a-half inches wide). This is similar to the common Microsoft Intellimouse range. It is therefore ideally suited to those of us that have large hands, making it comfortable to use for long periods of time. The mouse is symmetrical; making is equally suitable for left-handed users. The two main mouse buttons are also fairly large (over two-and-a-half inches). The size of these buttons makes them fantastic for quick reactions in circumstances when your hand isn't always on the mouse (such as when drinking a brew, or chatting in-game, before an enemy approaches). At each side of the mouse there are two well positioned buttons. These buttons have raised bumps, making them easy to locate whilst in-game. These button, like the two main buttons, are all customisable quickly via the Razer software. The Diamondback model is a wired mouse; my only gripe is that this can sometimes get in the way. However, the wire is sufficiently long to alleviate this as far as possible. The mouse is pleasing to look at; the materials used appear to be of decent quality and the matt black plastic doesn't look cheap. The red light does a great job of lighting up the mouse-wheel, and this light is also visible through the translucent strips on each side (although not to the extent that is shown on product images). These mice are also available in Blue or Green, if you prefer. The unique selling point of the mouse is the 1800dpi sensor. This is the rate that the mouse tracks movement, making it very sensitive and precise to use compared to traditional 800dpi mice. This takes some getting used to; however the sensitivity is adjustable at any time, even in-game, using the side button plus mouse wheel (this is what Razer call 'On-The-Fly Sensitivity'). Where all of these features really shine is in the heat of action in a game; the sensitivity is definitely useful for first person shooters and real-time strategy games. Whether my scores have improved is debateable..! Overall very pleased with this product and I would recommend it to others.