I have used Crucial memory for upgrade multiple times and have yet to experience a problem. 'O' typically has the best price (if you can catch the deals as they fly in and out) and, again, never a problem. I have bought this particular memory set for two ***** and installation is easy and works without great - even under high temperature conditions (that I do not recommend, however).
Nothing much to say here... It is RAM and it is working properly as it should. I would recommend this to anyone looking to upgrade their current system. This is the 1.35V version. SO be sure you purchase the correct type!
I thought thbook pro to Apple for an unrelated problem and they replaced the memory but gave me my the crucial memory back and told me that they were defective..# stars because Crucial responded to my request and they are going to replace the modules
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