I had a 10th gen i7 Lemur Pro from System76 until a month ago.
The good: amazing battery life (usually > 20 hrs), great screen, fast, flawless software support, very light, configurable keyboard
The fine: keyboard and trackback was alright, case was easy to scratch/chip, first time I needed repairs it was quick/painless
The bad: speakers were just terrible
The ugly: second time I needed service for the same failure took 6 WEEKS, returned with missing screws and without the power adapter, they told me I was mistaken 
The sad: it’s completely dead now, and my AMD Framework hasn’t announced when it ships yet.
I think I got a lemon and their support is not great, but I don’t think that’s most people’s experience. I still bought their expensive Launch keyboard even after the second time the Lemur failed. I don’t think I’ll buy another Clevo based laptop though…