I use 3 PCs in parallel. In principle, the switch works well, only occasionally it does not recognize the keyboard during startup. I then pull the plug from the active Pc and thus resette the switch. He then recognizes the keyboard. Here I miss a separate reset button, because when I have connected 3 pc's I have all 3 plug pull the switch energized to machen.Dies is quite annoying in the long run. Likewise, the switch does not work when I go up with connected Bluethooth function mouse.