Other than the hardware-specific issues, I’ve been amazed by how well Arch Linux works, given that it doesn’t have release cycles, or a big team with a lot of money supporting and marketing it. I’ve heard only 30 developers maintain the core Arch packages, with most of them having a full-time job doing something else! At the same time, it shouldn’t be a total surprise things work so well because free software doesn’t just fall off a turnip truck.