GOOD: VERY FAST compared to my previous i3, especially with two SSD drives; one 500GB and one 1TB. Using Linux Debian 10.5 AMD64; dual Samsung 24" screens; they connect straight to the back with two 6' HDMI to Desk Port cables. Everything works as it should. It's very fast, runs very cool and quiet.NOT TOO BAD: It locked up on me twice so far, in about a month of daily use (the whole day); but only under very heavy loads, while running several Qemu and KVM  Linux and FreeBSD virtual machines. It's pre-owned. I repeat, it really was under extremely heavy loads, like I've never been able to do before; compiling, listening to music, downloading and emulating many virtual machines all the same time, so can't complain. Thinking of getting a second one for my PC lab to split workloads. I'm doing more custom testing and documenting for clients so this is a need.UGLY: USB3 and USB2 ports don't work well together. I am using an external 2TB spinning USB3 drive for backups; had to disable all the USB2  ports in the BIOS. My USB3 external drive kept freaking out when I also used thumb drives on my USB2 ports; would switch from sdc1 to sdd1, back and forth, and my mount would error. Use only USB3 and avoid mixing older and newer USB sticks. Disable USB2 ports. Use only the USB3 ports.