I just looked at the System76 laptops, and they are strikingly similar to the Powerspec(Micro Center)/Sager laptops? Is the resemblance superficial or something else?
System76 uses Clevo/Sager laptops. However, they don't "just" pull off the shelf computers and put an OS on them, they're involved with the design of the laptops from the beginning.
This thread has more information from someone who works at System76.
This thread has more information from someone who works at System76.
https://news.ycombinator.com/item?id=17039414