Yeah, I've had a Deathadder for about 2 weeks now.
Overall, I love it.
Build quality seems decent enough, some
very slightly loose side buttons, but not to the point where it becomes a hindrance.
Awesome tracking, best I've felt yet. Good response on the mouse buttons, and they're quite large and easy to find, so that's good too.
The only thing I wish was different is the glossy plastic sides. While the top surface is some kind of rubberized grip surface, the sides are definitely slippery when your hands become a bit sweaty. One quick fix is to simply use some sandpaper