StarTech.com 4 Port DisplayPort KVM Switch - 4K 60Hz - Single Display - Dual Port UHD DP 1.2 USB KVM Switch with Integrated USB 2.0 Hub & Audio - Dell, HP, Apple, Lenovo - TAA Compliant (SV431DPUA2)

I have had this KVM for ~2 years now and have had very few complaints. I have 4 computers connected to it (3 PC's Windows 10, Linux Ubuntu 18.04), and one Mac. There are many things that I like about this device and overall I have very few complaints. You will need to plan on purchasing your own cables for it as it doesn't come with any, and be sure that you use quality DisplayPort cables. I have it connected to 2 Dell U2417H monitors and they work consistently, and are not blurry. I have found as another reviewer mentioned that if the computer goes to sleep that sometimes one of the monitors will not immediately come back. I have found if I power off that monitor and then turn it back on the issue resolves itself. Really only a problem if I let it sit overnight. Devices connected to the USB hub work as I would expect. I used to use an old PS2 keyboard with a USB adapter connected to it, but found that for some reason I would loose the keyboard on occasion, so I switched to a modern USB keyboard and all is good. The mac was a little tricky as natively the Mac only supported the one monitor. I was able to work around this by getting a dock that had two display port out connectors on it to connect to the KVM. Overall it simplified my setup anyway, now I only have one cable to connect.I would say that if you are going to use this and want to minimize issues I would recommend a high quality dock for your device to connect to the KVM. It will simplify your life, minimize shuffling cables and really clean up your deskspace.On all my setups I am using the native laptop monitor as a 3rd screen to the two external monitors with one set as my primary one.

I tried Acer, Apple, and Planar displays with cabling I verified could run 1440p at 144hz when used without this switch. I spent a couple days power cycling this and rebooting attached computers and monitors and was able regularly get Windows 7, macOS Sierra and High Sierra to run 1440p displays at 60hz, but it would often take a power cycle or two for that to happen. The exact same hardware rebooted into Windows 10 would show only 24hz as an option on about half my reboots, and the full range of the monitor on the other half of reboots. But, under Windows 10, selecting any rate other than 24 hz with any attached monitor resulted in no signal leaving the switch at all, and it would quite often freeze USB as well. So, Windows 7 and macOS are usable but you'll spend more time power cycling and rebooting than you would ever have spent just plugging in the cables whenever you want to switch. With Windows 10, this is a useless brick—and how the heck they managed to make a KVM give a darn about the computers' operating system version is mind-boggling, it should only care about shunting data on the wires.To clarify a couple points: first, power cycling this unit regularly is required even when its working under Windows 7 and the only way to do so is to unplug its power cable and so rack-mounting this could be a serious pain; second, 24 hz is too slow for the human eye as, for example, dragging a large window across a screen can cause the window to appear to bend as the bottom is moving after the top and a mouse cursor will appear to move in jumps and skips.[Update] I was able to get a single display to run at 60 Hz under Windows 10. Two or more seems to be what breaks under Windows 10 (or rather triggers the 24 Hz limit). However, I then found another problem with this switch’s DisplayPort handling: after Windows 7, 10, or macOS puts a display to sleep, there’s a 50/50 chance that 1-3 power cycles of the switch will be required for it to reconnect the display when the OS tries to wake it. Again, the only way to power cycle is to pull the plug from the switches rear. So, doubly irritating.

I've used this for 3 years and I'm quite happy. To echo others, it has issues with HDMI to DP which can ONLY be solved with a converter that has an extra USB connector. Overall, it wasn't a deal breaker for me. I love how with 4 USBs I have enough for a keyboard, mouse, camera, and on-desk mic.I've sometimes used it with 4 laptops (like when I had my own Mac and PC and a work Mac and PC), but I currently use it with my gaming PC, my work laptop, and a Mac mini that was overwritten with Fedora. I use the same keyboard with all and just reprogram all Mac keyboard shortcuts to Windows standards.CAUTION for those with powerful microphones: check what your USB version needs are. If not everything is backwards compatible.