One of the last mice of the "classic" x7-series. On a good mat, the razer goliathus speed works great. I hope it lasts a long time, the previous one worked for almost 6 years.
Pros
Comfortable in the hand, ergonomic design. Light weight. Lightweight and flexible cord. Rough surface without any erasable patterns. Perforation in the area of the thumb. Good optical sensor (3200 dpi). There are additional buttons: two side buttons, one for changing sensitivity modes and one branded triple-click button. Nice rubber scroll wheel.
Cons
The optical sensor reflects a little into the monitor, but the laser one is better. When you click on the scroll, sometimes you touch the button for changing the sensitivity mode (a matter of habit). The side buttons are located a little low in my opinion, a thicker thumb will constantly touch them.