All the long cables are Monoprice.com "slim run" fiber optic cables.
The HDMI pretty much just works. Even at 8k resolution. Note that last I checked, Monoprice's DisplayPort cables (as opposed to HDMI) only supported an older standard and they don't handle 8k. Most of my monitors are 4k though, and the DisplayPort cables work fine for that.
USB can be finicky. Sometimes certain devices, or plugging and unplugging devices too much, can "crash" the USB cable, requiring a "reboot" by unplugging it and plugging it back in, from the computer end. But if you're just using a keyboard and mouse through it it's basically fine.