Pros: Customizable design, 11 programmable buttons, 8200 dpi
Cons: Software , Price
At first it felt strange having used the Rat 7 for quite a while as its alot "clunkier" and heavier but as I prefer to claw grip the Ouroboros was easy to handle after a few minutes as its alot smaller (when you don't pull the end all the way back).
Its wireless design seems to be up to par and I didn't feel any strange lag when playing games or browsing online.
If you haven't already used a ambidextrious mouse it might not feel the same as it doesn't lean towards your thumb like most right hand mice. The "lefties" should be happy with this as there aren't alot of mice catering for left handers on the market.
For anyone wanting to get this mouse the only 2 cons that it has is that the software sometimes is kind of buggy and of course the very very high price.
Full Review of the Ouroboros Elite gaming mouse http://www.hardwarepal.com/article/razer-ouroboros-elite