Pros: Build quality, "design"
Cons: Execution, design
First, this mouse is beautiful and extremely well-built. I am confident I could bang it against my desk repeatedly without worrying about loosening any boards and certainly not scratching the chassis. The buttons have a nice actuation except for the scroll-button and the side buttons, but they loosen up over time. I'm not a fan of LEDs but these were subtle and looked nice. The braided cable is a very nice feature and bends pretty freely, so you don't have to worry too much about catching your cord on your desk or whatever.
There are lots of reviews about the software, but that should be fixed eventually and who uses macros anyway?
The sensor isn't the best on the market, but it is solid and should meet the demands of all but serious professional gamers. Many other reviewers have covered this in-depth, so I'll let you refer to them.
However, Corsair didn't seem to consider the user that much when designing the mouse. I have slightly above average length hands at 8" from palm to middle fingertip and could not find a comfortable grip with this mouse. Holding the mouse as I usually do, a fingertip grip with two fingers on top and the rest on the sides, I was constantly pinching my pinky under the right side of the mouse and would have to shift my hand forward to reach the snipe button. Moving to a claw grip I found I was in the most exaggerated claw I've used and my hands cramped quickly after, but I was able to reach buttons more easily and my pinky didn't catch on the side. However, I did find that this mouse was very comfortable in a claw or fingertip grip if I were to put three fingers over the L/R/scroll buttons, but I've never done this before and was uninterested in learning to use my mouse - I think a mouse should be an extension of your hand rather than a tool your hand uses. Strangely, I also found that it was very comfortable in a palm grip with two or three fingers on top, but I don't palm so no-no for me.
So, while I loved this mouse in many ways, it was easily one of the least comfortable mice I've ever owned, including many strange track balls from the 80s.