I really want one but I just can't justify paying like 800-900€ for a dual-monitor four-computer one when I have a USB switcher and can just switch inputs on my monitors.
I was hopeful and tried using this Monoprice KVM switch (linked below), but it just wasn't worth it in my experience. Despite supporting Display Port 1.4, I could not use my monitor to its full ability with my PC (3440x1400 @165Hz w/ 10 bit color). Dropping the connection when switching inputs was also incredibly annoying; every time I switched away from my Macbook it would go to sleep.
I'm happy to switch inputs on both the USB switch and my monitor separately because it's not actually too large of a hassle, and the monitor doesn't "disconnect" when switching video inputs on my monitor so my Macbook doesn't immediately go to sleep.
If anyone is in the market for a KVM switch, consider a USB hub first. You might find yourself satisfied. They're much less of a hassle and cost very little in comparison to a full featured KVM switch.