From my experience their repair services are somewhat understaffed: they did a fine job as described but I had to keep asking them for status updates and it took about a month. Kind of a sharp contrast to the ThinkPad overnight shipping, same-day repair, overnight return shipping experience.
I was thinking that System76 might have problems not being in a volume sweet spot; IBM and later Lenovo could invest a lot in a fancy, well-staffed repair facility near a shipment hub, while System76 may get warranty and repair requests that feel only occasional and so just can't support huge investments in being great and fast at it. :-(
I'm still hoping to continue supporting them because of their commitment to Linux-based computing. (Edit: other people in this thread sure didn't seem to like their laptops, but I guess I had a much better experience in other respects.)