Summary: I bought a DeathAdder over 4 years ago, and find it fantastic. Looking at other reviews, there could be the occasional defective unit, but in my experience, it's durable, precise, comfortable, and super slick.
Summary: Worth the money, this is a very comfortable and aesthetically-pleasing high-performance mouse that functions very well. This is my second purchase of this mouse. My first one lasted 3 years and I very regularly use my computer.
Summary: I'll start off by saying I'm a pretty avid gamer, and I usually range around 2.0 for a kdr. In the past I have always used regular mouses, be they wired or wireless. This mouse is the first gaming mouse I have ever used, and it's the first wired mouse I have used in years. First off, the aesthetics.
Summary: I have had this mouse for over a year now, and I am a casual/competitive gamer, so it gets quite a bit of use. The overall mouse is very comfortable in my hand (and I have big bear mitts), good click responsiveness, and the buttons (including the forward/back buttons) are all well positioned.