As expected really. Roughly twice as fast across the board as my 12-core 2.93GHz MP. A few minor issues with OS Catalina (but then who doesn't?), and some instabilities with the 5700XT, so I'm still driving my trusty old LED Cinema Display with the RX580 – I hope 10.15.5 solves this too. It's great that I can shove up to four GPUs in it, while really the old machine could only cope with one powerful card. I have 64GB RAM and a total of 13TB storage including Time Machine backup. Just waiting for a GPU-based renderer now...