Easy install
Cheap
Compatible with 1333MHz based Mac laptop or desktop (2011 model)
Weaknesses:
NONE
Summary:
Install 2 rams without problem. Compatible with MacBook Pro 2011 model. Great and cheap upgrade. It will cost you 200 bucks buying from AppleStore. It will work with Mac as long as the MHz is matched to your factory setting. i.e. MacBook Pro 2010 model uses 1066MHz and will NOT recognize 1333MHz ram. It will not down-grade the ram speed like in windows-based laptops. Unless you want to stick one 1066MHz ram with one 1333MHz ram, you will have a 1066MHz running laptop at the end.