Their desktops are great, we use them for all of our dev boxes. Their laptops are basically branded Clevos, they're plasticky and feel like they were duct taped together. This is pretty typical of most of the "Linux Laptop" vendors.
As someone who owns and works on the exact same machine mentioned in the article (Galago Ultra Pro), I agree. It's build quality isn't that great and the non-computing hardware is sub-par (battery, fans, bezel, touchpad...).
I just wish there was a real alternative to the 13" Air.
I will not buy System76 laptops again because of the build quality. I had one, and an minor accident with it was a disaster. The computer wouldn't start after.
I have a MacBook Pro for work and a Dell Inspiron with Ubuntu (which I bought on the day the System76 failed) on it. Generally, I like the latter.