Pros: Well constructed. Dual-channel. Easy to identify. Attractively priced. Works perfectly with the same model I had in machine (I'm now at 16gb - 4x4gb).

Cons: None so far (two weeks in).

Overall Review: Make sure that you buy the same model number of the RAM you wish to put in the machine, whether buying all-new or adding memory sticks. I bought from two different vendors, but the same model number. Subtleties can make all the difference in functionality.