My 2012 is starting to show signs of hardware failure. Extreme sluggishness even after a clean install of osx (which took forever etc). I would like to throw in a more modern faster hard drive perhaps even a SSD. I started looking at the tutorial to get into the machine, and got nervous after I saw the suction cups. If you paid a shop to do yours how much did it run. If I wanted apple to install a non OEM HD would they even offer that service? Just looking to find out the complete picture before i take the plunge.