What I really like about Corsair Vengeance RAM is the true plug and play aspect. Every kit I've installed for friends or clients has worked correctly right off the bat. In all cases there has been no need to adjust BIOS settings to proper timings or voltages. The memory just works as expected.
It's because of the above - and past experiences as an owner and user - the Corsair name, to me, has been one of ease of use and reliability. Those are the two most important features I look for and Corsair has never failed to deliver.
Customer service at Corsair is top notch. Bought a 800D that had a bad hot-swap bay (#3 down from the top), called the customer service line, and they send me the SATA-6gbs upgrade backplane for free, no hassle.
The ease of that let me to purchase a Force-120 drive instead of the C300 i was thinking about. Wanna support good people. Also purchased 24GB of the Vengeance RAM for my Big Bang Xpower build. I've also purchase countless number of power supplies from them, multiple H50's for the various builds i have done, and a H70 on this latest build. I think the only product i haven't used by them are the headphones, and speaker set. The USB headphones are definitely on the list for my nighttime gaming.