Pros: Installed in a 2011 15" Macbook Pro. Great drive while it worked, and it was a fantastic upgrade for my machine. Replaced the SuperDrive with a HD mounting adapter, and had it pretty good for a while.

Cons: After about a 18 months of relatively light use as my main boot drive in the laptop, I started getting beachballs every hour or so. It's a known issue that can be fixed with a firmware update. The firmware was only possible to update a) with an optical drive or b) by booting the machine into Windows. Option A requires opening the MacBook up, and option B requires going through the gymnastics of installing Windows. Got it done, but ultimately, if Crucial advertises on their site that their products are Mac compatible it's not really true if firmware upgrades for the common case of one replacing their optical drive with a SSD requires some ridiculous work-arounds.

Overall Review: Please. Fix this by releasing instructions/utility/anything on how to make a bootable USB stick with the firmware image on it.