Cons: Drift Control, scroll wheel, LoD
The first issue is that infernal drift control that can't be disabled. Drift control is virtual friction. Added with a soft pad like CM-Storm AK DM or Goliathus, this juggernaut of a mouse is impossible to move, effectively reducing the 3500 DPI to 300 DPI. Even if you get a glassy pad (won't work on normal glass) the smallest movement it can perform at highest sensitivity is 2-3 pixels in my 1366x768 display. Worthless for FPS.
I do not know why Razer thought it would be good idea to implement drift control, I think their target customer base was people with Parkinson's disease.
The scroll wheel is another agony. After a few months of use, it keeps scrolling in reverse due to a defect in the scroll sensor holder.
This mouse is not a laser mouse, it is infrared like in laser mice, but the beam is scattered. The LoD of this mouse is too high and personally I have never been able to fix that using the tape trick. Even if you manage it, bear in mind that tape trick reduces effective DPI. If you reduce DPI in this already horrible mouse, nothing remains.
This mouse lasts long though. It never truly stops working until you destroy it with a hammer out of frustration; which I did.
Avoid this mouse like rat plague.