Every time I switch, Windows10 thinks one of the dual monitors disappears and moves all of my windows into one screen. I have to move them back every time I switch. Not great. The switch itself takes about 10 seconds, and sometimes one or both monitors will blink on and off for about 30 more seconds until they seem to settle. Never had that problem before this switch. If you're not in a hurry though, and you're willing to hardcode your resolution settings in Linux's xconfig file(gnome's auto-resolution detects the kvm as 600x800), this kvm does ok.
Also, you better clamp it to your desk. DVI cables are stiff and this thing takes six of them. It'll stick up in the air like a flower and will stay in place just as well, when you're trying to press the switch button.