BUT: After a few months of use - to read in many places on the web and I also go back:
The left mouse button bounces after a few months of the (non-excessive) use and caused extremely often unintended double clicks. So many applications and games are no longer operable.
Reason is too soft plastic part under the button, which over time will suffer by using a notch. Thus, the internal switch is no longer reliably pushed down, resulting in the double-click.
The notch can be fill with for example. (Good curing adhesive), so the mouse is used in turn 2-5 weeks. The repair procedure is repeated until one is ready to buy a new mouse.
This problem is Razer specific and known to earlier models. If there should be a deliberate effect by the manufacturer, so you do eventually a new mouse to buy, then the mouse should least keep one year. For me, the game went off after 5 months, and drives me to now 8 months in the madness, or a new mouse.
The new mouse will therefore be no Razer until I read somewhere that Razer eliminates the conscious or unconscious material weakness.