--Construction--
It is nice and clean, there is in addition to the wheel and 2 buttons below this one, 12 user- programmable buttons on the side. They fall well under the thumb, although the last row (closest to your hand) is inaccessible to my small hands, my thumb does not bend enough !!
The more this mouse is for fools customization with 3rd button below lannulaire and little finger:
Of that lean, it is possible to assign a function to all buttons SECOND !!
One can also choose the color of the keys over the driver and differentiate profile via a specific color.
There is a FPS mode that when a certain button is pressed to decrease sensitivity (useful for sniper)
--Installation--
Driver Logitech exists for Mac and PC, to store different profiles on the computer.
A nice interface and quick setup of the keys!
--Conclusion--
I bought the Razer Naga 2014 and has to choose between the two, I would take the Naga that for me (and my small hands) to a better grip and a cloud sync the parameters of my mouse.