iMac 27" EMC 2639 Repairability Score: 5 out of 10 (10 is easiest to repair)

RAM is user-replaceable without opening the case, thanks to the rear access door.

You can still replace the hard drive and CPU inside this machine, albeit with some adhesive cutting.

Components are modular and fairly easy to remove.

Budget-minded folks now can add a second hard drive to the base iMac because the Fusion Drive connector is no longer missing from the logic board.

The glass and LCD are fused together, and there are no more magnets holding the glass in place.

You'll have to masterfully peel off the old double-sided sticky tape and apply new tape in order to reseal this iMac into original condition.