I use to use Geil and had a bad CSR experience with them. I switched to Corsair and had to interact with their CSR department and found them to be more than helpful. I have never used anything else since. Thats why I like Corsair.
it would be easier to post what i don't like about corsair. i have a corsair power supply (hx1000) ram (dominator ddr3), chassis (600T), and cooler (h70).
so far what I don't like about corsair is... nothing.
what do i like about Corsair? everything! their products (memory, H50, SSD) grace my system and ram guy helped me with technical issues with another manufacturer's SSD i had bought when that manufacturer wouldn't. needless to say, that SSD was sold and one by Corsair was bought. I have black Vengeance memory but would love to mix in a set of blue ones.