Excellent support, great for OCing, high quality control --every set of RAM I have bought from them has just plain worked. I won't consider any other brand.
Corsair has always kicked ass, reliable and compatible with some of the best warranty support out there and they're usually one of the first ones to market with new super high end RAM kits. They're pretty much the only memory I use.
As much as I like the "Corsair" ship design and logo for the company; Wouldn't updating the logo to the silloute of the F4-U inverted gull-wing, at least for the memory products, be a better idea.
Because Mushkin sucks the big one. A-holes sold me ram (under 2 years ago) that they no longer sell/support and I can't add more ram due to the crap being non standard frequency and messed voltages...so mad. Guy at our wicked local PC store told me to buy Corsair replacement sticks.
I have to agree with the PSU post though, so far mine has been well worth the premium, no fan whine or random system crashes..even with cats in the house and hot dry dusty summers