Pros: I was surprised when I fired up my MBP and saw that I now had 751G of storage, usually I get a decent amount below advertised space. Works great, not much to say.

Cons: none yet.

Pros: I upgraded from 2GB to 8GB on my mid 2009 Macbook Pro and it really sped it up. I usually have several applications all running at once and some taking up a quite a bit of RAM and this really helped the slow down that happened from time to time. For the price it was a well worth it over getting 4Gb.

Cons: Oe of the first two sticks was bad and kept causing kernel panics. I returned for a new pair and have had no problems yet.