http://www.eweek.com/c/a/Desktops-and-N ... it-396267/
Not making things easy on the repair front, the iFixit team found:
• Apple used the proprietary pentalobe screws that it developed to keep owners of its devices from opening them up. iFixit sells screwdrivers, as well as whole toolkits, for getting inside and making repairs or upgrades (in most cases).
• The laptop's RAM is soldered to the logic board. Max out at 16GB, iFixit advises; there'll be no upgrading.
• The solid-state drive (SSD) isn't upgradeable, though the team has hopes that in the future they'll be able to offer a fix for this.
• Apple glues, rather than screws, the lithium-polymer battery into the case, which increases the chances of the battery breaking during a disassembly.
• The glued-in battery covers the trackpad cable, "tremendously" increasing one's chances of shearing it while removing the battery.
• The display assembly is fused, with no glass to protect it. Apple figured out how to do without the glass to make the laptop lighter. "If anything fails inside the display, you will need to replace the entire (extremely expensive) assembly," notes Wiens.