Razer is well known among gamers for their ever-growing range of gaming mice. One of their more recent, the Deathadder, is a breath of fresh air to some of the right-handers that have been yearning to break free of the universal style grip previous Razer mice like the diamondback and copperhead offered. I'm one of those people, and yes, the right-handers mold of the Deathadder is nice.
Ofcourse Razer never fails to make a sharp looking product. The blue glow of the Razer logo on the body, and the blue-lit mousewheel against the all-black body is very sleek. Performance isn't lacking either. The 1800 DPI sensor is more than enough for most gamers. It's unfortunate that people quickly succumb to the whole "I need more DPI" mentality, when in reality there probably aren't any gamers that do need it.
With the Deathadder, you have all fo the features you'd expect from a gaming mouse. On-the-fly sensitivity is becoming more and more popular as gamers take advantage of this quick and easy feature in the middle of the shooter game of their choice, and even I use on the fly quite a lot in photoshop work, it's great when you're doing that fine editing.
All in all, it's a great mouse, and it's certainly a different feel from other Razer offerings. The reality is that most of Razers mice have similar excellent performance. The real question you should ask yourself is which is going to feel the best physically. For that, I suggest going down to your local B&M and gripping a few on the shelves.