Summary: Had this for 6 months running an i7 3770k overclocked to 4.5Ghz and running 2 GTX 660s in SLI. It's still pumping juice into my rig very well and doesn't waste power by having the fan on un-necessarily. Great PSU!
Pros: - Fully modular, - Clean cable sleeves, - You can buy individual sleeved cables in different colors off the Corsair website!, - Fan only goes on when needed
Cons: - A little bit on the pricey side, but for what you get, it's worth it!
Summary: Awesome PSU. Very easy to install and easy to keep things looking neat and tidy. Plenty of power for everything and then some, it's definitely the best 850w power supply in my experience. It's quiet and runs perfectly well, would definitely recommend.