Summary: I ordered two Corsair memory on recommendation from my son. One was defective out of the box. Called Corsair --2 or more weeks after receiving the bad one before they would ship replacement. Called (seller) about 6 pm. UPS delivered replacement by noon the following day. Amazing! I love doing business with (seller).
Summary: EXACTLY one year after these came to my doorstep, one of the modules died. The computer suddenly froze (keyboard, mouse, none reacting) and when I rebooted I heard a 3 short-beep sound during POST (usually indicating RAM problem) and the number "55" on my Z77 Extreme4 which also indicates RAM problem. Took them out, tested the slots (they were fine), and the computer works fine without them. Now you may be saying "well, it happens, no need for a 1 star review".
Summary: Excellent quality and great looking RAM. Exactly as stated and had no issue installing. It overclocks easily as it is setup to be used with higher frequencies as long as you set the voltage high enough, this stuff can handle what you throw at it. You can't go wrong with Corsair !
Got it on May 22 now it's June 10 and it has errors
9 June 2013
Summary: Okay I picked up this RAM for a NAS4Free build. It ran great for a week then the NAS started failing. I looked for problems took out all the hard drives, installed a newer version of NAS4Free then I ran Memtest86+. It has errors and the bad thing about it since it was working at first I got rid of the box and everything else from the shipment. So now I have to spend more money for more RAM but I don't think I'll go back to Corsair. purchase at your own risk ...