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Just make sure you get it from somewhere that guarantees compatibility. If it doesn't work or is unstable, you get your money back.
 
I currently have a 2x2GB Crucial Upgrade Kit installed in my unibody MacBook and have had zero issues with it (it's been several months now since I installed it)... though that's not surprising considering I've always had good experience with Crucial RAM.
 
Yup. Because you're not running Apple RAM. Apple has Apple hardware made specifically for it's computers.

(I have Crucial 2x2GB. If it's not running right, it's the RAM. Exchange for new kit or return and buy Crucial. On here, Crucial is by far the most reliable brand with awesome support.)
 
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