I installed this on my macbook pro 8gb mid-2009 that were only 4GB. And I'm very satisfied with the little more power this lavish, especially when we began working on large files gourmands software (such as Photoshop or iMovie). Ideally this should be combined with an SSD and would be perfect. The packaging was simple but sufficient to protect the two bars, nothing to say at this level. Quick delivery (within 4-5 days). In short, satisfied customer.