works great after you set it up properly. there are a couple of items that are not explained or fully disclosed as to what you will need to connect to your pc/laptops. for each laptop or pc you will need an hdmi/usb cable which is provided in the kit to run from your pc/laptop taking up one hdmi and one usb port on your pc/laptop to the usb and hdmi -monitor port on the kvm switch (either a/b/c depending on which monitor you want which pc/laptop to display on). this only allows you to display up to three pcs or laptops on one of the three monitors (one pc/laptop of the four pc/laptops possible to be connected to the kvm switch to display on one of the three monitors). if you want to display each of the pc/laptops across all three monitors at once - you will need to two additional hdmi-hdmi cables per pc/laptop and two additional hdmi ports on each pc/laptop. here are the problems: one this is not made clear in the product descriptions to know this before purchase, two: there are not enough hdmi-hdmi cables provided to connect all possible four pc/laptops. there are enough for connection of three pc/laptops with one extra hdmi-hdmi cable, to hook-up four pc/laptops you will need to purchase at least one additional hdmi-hdmi cable, and three: you need to look at your pc/laptops carefully. most will not have three hdmi ports and a usb port. the normal standard for laptops is two usb, one hdmi, and one usb-c. to make this work you will therefore need a usb or usb-c docking station for each pc/laptop that does not have enough hdmi ports. in my configuration of three laptops connected to three monitors in which i wanted to display each of the laptops across all of the three monitors one laptop at a time - i needed to purchase three usb-c hubs with each usb-c hub having at least two hdmi ports. i connected each usb-c hub to each of the individual laptops via a usb-c port and then connected the two additional hdmi-hdmi cables into the usb-c hdmi ports and then to the kvm switch input ports for each pc/laptop connections for the two monitors not connected by the previous hdmi-usb cable. this was an expense that was not clearly identified in the purchase advertisement literature or even explained well in the product user-manual. i had to go out to the web and find third party videos and articles on the set-up before this became clear.