In my opinion, the Razer Imperator is unbeatable in design, the adjustable side buttons are great and really set on each hand.
For comparison, I have had many mice already in hand, including Razer Death Adder, Logitech G9x, Razer Lachesis ...
The Imperator has to offer from all the by far the best ergonomics.
My hand and my wrist I feel not even after hours of Starcraft 2 or Bad Company 2 Sessions
(It is probably also a matter of how to create his keyboard-mouse combination).
Furthermore, you can put your thumb in the beautiful Kuhle provided in other mice I got at least after some time always thumb pain because I had to keep clear of the Mouse thumbs.
Ergonomics *****
The software (downloadable) I give 5 stars because there are really tens of adjustment possibilities.
One can (eg drag and BC2 gun directly aimed at key, or ping at SC2 Map, produce units, etc.) infinity Macro super quickly define a gain enormous advantages in some situations. In total there are 5 customizable buttons, the up and down movement of the mouse wheel can be additionally occupied (So 7). In addition, you can create different profiles for games and let call them directly as soon as the game starts.
Software *****
For the processing, I can only say that here the only point with which I am not quite satisfied, so I give here only 3 stars. In my case initially appeared also the problem that the mouse sometimes in the Game "hung", ie they will light but still can not move. Unplugging - plugging and we went back, still very annoying.
Initially, this problem was relatively frequently!
After a new set up of the driver software of this problem occurred in recent months, with daily use, but only 1 time.
Processing ***
Since I'm usually really convinced of the mouse she gets from me **** stars!