Oh man, bought this mouse a few weeks ago, about a month, and with the Razer Exactmat X Control, and boy does it perform well. Im a keen gamer, yes it don't sound like much, World of Warcraft, but during PVP it owns everything.. Recently ordered a Razer Lycosa Mirror Keyboard, hoping it to out-perform my Current Saitek Cyborg Keyboard, it's ugly as hell, and the buttons are slowly dying off one by one.

The mouse overall has the fasest, and best response time i can ask for, it gives high sensitivity but with high precision.

5/5 for me, stylish, practical for every day use, and excells all expectations from razer being it my first product.

~Dan

This mouse is an improved edition of the "old" DeathAdder, shares its ergonomic shape and button layout, but features an improved 3500DPI infrared sensor.
The DeathAdder is imho the current pinnacle of optical-tecnology-based mice. Before getting the DeathAdder, I have been a 4 years old Razer Diamonback mouse user (1600DPI). The difference between my old mouse and this one is quite impressive. The DeathAdder is MUCH more responsive, you might want to tune down the sensitivity a bit or you won't tame this beast at its fullest might. Also this mouse feels very light due to the ridicolousy low friction with the surface (slightly taller teflon feet), and I'm not even using a dedicated mousepad. The mouse shape fits perfectly my (average sized) hand the 4th and 5th buttons are readly avaiable right under your thumb, the 5th requiring next to no movement of your thumb to be pressed.
The drivers allows for some nice configuration and customization of the device. Because my PC is in my room and is on at night, I enjoed being able to turn off the logo and wheel blue leds by software. Also infrared sensor means that no visible light comes from "under" the mouse.

Overall I'd reccomend this mouse to all palm-grip gamers, it's worth every single penny. Also the packing is really nice and I even got a free Razer branded cap with it =).