Mine is the 2012 model before the retina display. Phillips head screws everywhere instead of the pentalobe. Open the case and you have access to everything. Battery can be replaced in 2 minutes. Hard drive in 1 minute. RAM in 30 seconds. Trackpad another 2 minutes after pulling battery. I even took out my optical drive and installed another hard drive in the bay since its SATAIII on that model. Then they came out with the retina mac and glued and soldered almost all of the above.