I've bought from Crucial too, and been a satisfied customer. Still am, really, but when I enquired about a memory upgrade for my white 2009 MacBook, the assistant wasn't aware that it can take more than 2 gigs of memory. He was adamant that it couldn't! I know that's what it likely still states on Apple's web pages but I was surprised at his response, nevertheless. (It can take six apparently, though some users have eight installed successfully. I'm still running mine on two without any real issues.)