I was with my friend (elfen) in PJ today, watched him COD the Deathadder from jy14, and then went back his house to test the mouse. Here's a short review after approximately 1-2 hour of usage, both in casual desktop usage and gaming:
Before starting out I can say that I'm pretty much a performance-based mice lover, and performance DOES matter to me a lot, as I consider myself a serious competitive CS player. And so far I have used many mice before, starting from the MX300, MX518, Logitech G3, Razer Diamondback, Copperhead, Krait, MSIE 1.1, the MSIE 3.0 (current), and lots of shit mice that doesn't worth mentioning (eg ms laser 6000). So for the casual consumers, my comments may not make sense to you or it probably doesnt matter to you

Opening up the box, the Razer Deathadder feels very nice at the first touch, rubberized upper body coating like the ones on the previous Razer buttons, and a hard-plastic lower body. I immediately feel the need to use this delicate mouse VERY CAREFULLY, as the rubber coating feels like it might tear or damage by the smallest means of damage. The shape of it is almost identical to the MSIE 3.0, just a teeny weeny bit shorter in comparison. The two left and right clicks aren't as soft and easily clickable like the Copperhead, but it's close. Easily clickable buttons actually present a problem to me sometimes as when I flick my mouse quickly to aim at someone from the side, I MIGHT accidentally click the right click and I start to install the silencer on my M4, and die (in game of course). However, the two buttons at the side are REALLY solid and clicking it feels so good. Comparing the side buttons, the MSIE 3.0 side buttons are really loose and doesn't feel as good, doesnt feel as clicky.
After installation, I loaded up the driver software and well, it was the usual Razer-like interface, so I won't go on about it too much. The DPI offered is a bit weird though, instead of the usual 400-800-1600, it gives 450-900-1800. High DPI doesnt appeal to me at all. I use 400dpi for gaming

just a note.
Starting up CS 1.6, I tried flicks in game and deathmatches to get a feel for the mouse. The mouse was used on an Everglide DKT pad surface. This is where the magic comes in. FYI I use a VERY low sensitivity in CS, 400dpi/windows sens default 6/sensitivity 1.15. That means I have to do two full flicks across my QCK+ mousepad (approx 40cm wide) for a full 180 degree turn to frag the ones shooting behind me. To do that I have to flick the mouse at a very high speed, and this is where most mice fail me. Even with my current mouse MSIE 3.0 clocked to 500hz polling rate, it suffers from heavy negative acceleration and the crosshair ending up pointing only a bit away from the original position. The Copperhead CANNOT perform this at all. When I do a full 180 duo-flick, it skips and looks at the sky or the ground, or doesnt move at all. The far worst is the MS laser 6000, that doesn't work at all with my sensitivity - it just looks at random directions and moves around like it's crazy when I move my mouse, piece of crap. While using the Razer Deathadder, no matter how fast I try to flick it at insane speeds, it goes EXACTLY where I want it to be. I'm most impressed. I have always disliked Razer mice as they are so commercial about 2000dpi, 1000hz polling rate, always-on engine, etc etc but ending up the mouse being useless crap to me. But the Deathadder proved me wrong.
I won't give too much comments on the design, because design appeal is very subjective to one's perspective. The blue lights though, wasn't as bright as it is as in the commercial pics, but hey, it's Razer!
So much for the pros, here's the con: It still feels very delicate to me! I don't really dare to use it as freely as the mice I own because it feels like the rubber coating is soooo delicate...... Or maybe it's because it's my friend's unit, not mine. Lol.
Conclusion: I would recommend anyone who has used the MSIE 3.0 mouse before and liked the shape, and looking for a new mouse, GET THIS MOUSE. It's a steal at RM195. I really liked the MSIE 3.0, but the old engine as proved to be inferior when compared against the Deathadder. The egronomics are perfect, though. Best Razer mice award from me so far

and could be considered almost the best mouse (not price-wise). And I'm a Razer hater. How much this mouse surprised me is impressive. Or maybe if you are just a casual gamer and didnt know wtf of 50% the stuff I mentioned about above, just go for the mouse you think it's the most beautiful/highest DPI/etc.
Oh, and I won't bother to spend my time writing this review if Razer released another piece of rubbish.
Thanks for reading - a lot of you guys need to know more about mice perfomance.
Note: I hope my review doesn't lower the sales of the Coppearhead and other mice a lot. Sorry jy14/ngbh, plz don't kill me.A good review,but I'm getting worried about how fragile the rubber coating on the mouse it. Will it start peeling off or breaking apart in a few months after use?