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We use Corsair extensively at work to upgrade IBM ThinkPads and it's excellent. Certainly as good as Kingston and a fair bit cheaper.

Not tried it in a Mac, I usually recommend Crucial as it's certified compatible.
 
I have used Corsair in some extreme gaming rigs, i.e. oc'ed and liquid cooled 12 gigs (3x4gig sticks) @ 2400mhz on the Dominator series with great success. They are known for excellent quality. :D
 
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