Summary: ROCK solid power supply. I'm thrilled with it's operation and the fact that it almost never even kicks its fan on - probably because I'm not pushing it hard enough. But, its clean power, nice modular ports, solid construction and high efficiency are real winners. I really like the Corsair Link software that sees it (so long as you plug in the special (weird) USB cable that comes with it.
Summary: So I would call myself a Corsair fan boy seeing as I have so many Corsair things, BUT that doesn't mean I didn't do my research. I read the review of Johnyguru, a very scientific site and thorough site, and saw that it was actually a very good PSU. Very low voltage ripple and very efficient besides the fact about the Platinum labeling. It's also very quiet.
Summary: Got this at a great price(around 300 bucks). It was 369 at my local store.. This thing is a beast,its quite,got more power then anyhtign I will hook up needs. Only con I felt a lil ripped off they Give tool kits and sticks with the 850,s but this came with nothing but a sticker .