Summary: I put a lot of research into this before purchasing a power supply. The Seasonic units are among the best. The unit was packaged wonderfully, plenty of connection cables for the motherboard, video card, and other items. Installed fine. I was so impressed I ordered a second unit later for my second PC build without hesitation.
Summary: First one failed shortly after a year; a capacitor just randomly blew up. Aside from it blowing up within a foot of me, the only thing I can complain about was that it suffered from coil whine. At that point, I was still willing to trust Seasonic for further PSU purchases. I filed for an RMA and received the replacement within a week. Wow. I figured, Seasonic must really care about its customers. Wrong. The replacement I received was a dud as well.
Summary: First time buyer of Seasonic and I'm very impressed. Works like advertised and I feel confident based on the observation of how well the unit looks and the quality of the contents included; the module cables even come with their own carrying case (minor, I know, but adds to value). I used this on a server setup with the non-hybrid option enabled.
Ferrari of the PSU world. Fantastic Ultra-silent Power Supply. Extremely high quality.
David P. "David", Amazon
28 March 2014
Summary: Replaced the PSU in my 6 yr old Alienware gaming PC because I got tired of how loud it was. Seasonic is completely silent. In HYBRID mode, the PSU will decide whether it needs to run the fan, which it rarely does on a system comprised entirely of SSDs. The impressive packaging tells you this is a high end part. Ample cabling and even comes with plastic ties to tidy things up (nice touch). I couldn't be more impressed with this beast.
Summary: This has been a great high power PSU with a single +12V rail design that has survived overclocking my i7-2600K and feeding a power hungry GeForce GTX 470 and a handful of high capacity hard drives. I've recently upgraded to a GeForce GTX 770 (4-GB) and although the idle power draw has dropped, the peak power draw can still be quite high. This PSU has kept up with my demands and shows no signs of failing yet.
Summary: This thing runs a 290x and i7 oc'd just fine. It's completely silent and cannot be heard over any of my other case fans, Cougars and Noctuas. Being modular it makes for a very clean case, and the flat cables are easy to stuff between the case and side panel.
Summary: I'd replaced two thermaltake psu's in the past that just quit. Finally replaced them with a 650w antec (antec are rebranded seasonic) and never had a issue since. So for my new build, I purchased this PSU. Plenty of power for my build: i4770k 16gb - ASUS maximus VI heero GTX780 4x SCSI3 HDD's 1x SATA 2x optical The gold rated efficiency claim I tend to view more as marketing since psu mfg's police themselves, besides, efficiency ratings only matter for over 80%...
Summary: Seasonic continues to be one of the best PSU manufacturers around. With power supplies, you tend to only notice them only when they've gone wrong, and I can say this has not been the case with my X-850. By keeping up a steady supply of current to my system, my Seasonic has become the silent backbone behind my rig. It's so quiet that I'll sometimes even forget that there's a fan on there! They'll continue to be a highly recommended brand!
Summary: I've been using it for 4-5 months with no negative issues. Radeon 7970, 3 HDs, optical drive. It had plenty of clearly labeled cables, runs very quietly, and has performed like a champ. Highly recommend.