Very high quality ram modules, as expected from a well known brand such as Corsair. Extremely easy to install, open MacBook/MBP, remove old ram modules, which are Hynix ones, and insert the new one by one making sure it is locked in place. Booted up, everything normal, except everything feels snappier and faster. Amazingly cheap for 8GB compaired to Apple stores. Shipping was very fast.
Ram modules were pretty hard to get out of packaging so make sure you snap them out the plastic holders very carefully, they feal quality.
I chose this Corsair ram not only because it is cheaper than other Mac Memory, but because it uses Corsair's own chipsets. It is very important to pay attention to the brand, as well as the flash memory chipsets it uses, the Mushkin one I wanted to get, observed closely on the picture and saw it had hynix chipset modules, which I gladly refused. I'd get this one over any other just to be safe ensured in quality, performance and price ratio. Also, not every mac supports 8GB of ram, it depends on your motherboard and CPU platform model do your research/homework first before buying,
<-- this applies to all parts, and is the golden rule to hardware part upgrading. For more info, do a google search to see if your specific mac model will support 8gb max or not