The build quality is such rubbish, and you begin to feel it almost immediately. I'm careful with my kit, not terribly hard on anything and I manage to flake bits of plastic or metal off each System76. They've always been in neoprene cases within a laptop backpack - because I'm that paranoid. They're just rubbish.
At this point Ubuntu (or Mint, or Debian!) on Alienware is my laptop of choice, and I run those Kingdel desktops.