Likewise, I've not had any experience with Geil nor G.Skill, just Corsair - but their customer service is awesome... and I say this primarily referring to, I bought a pair of 512 sticks, then a year later, bought another set...but they didn't work together. They offered to ship out a brand-new set of four to replace the ones I had... and a lifetime warranty - like most... I'm a fan, so far.