It's been working flawlessly for me. Brand new cards can be a little bit buggy at the beginning as they release before the drivers are quite ready, but my Vega 64 and RX 570 have been absolutely flawless the last 4-5 years. AMD's fine wine reputation is especially true on Linux.

I've always had issues with NVIDIA's drivers and basically never with AMD. I can't recall when is the last time I had driver-related graphical issues, but I sure can with NVIDIA. The only time I've had issues with my AMD cards is when I bought the Vega 64 at launch and had to run a dev branch kernel and mesa for it to work properly, but once that made its way to mainline and release kernels I haven't had to do that since.