I've had several KVM switches in the past and they've all had problems (or my computers have had problems) getting stuck when switching back and forth. This has worked flawlessly so far. The only problem is that one of the computers doesn't wake up when I switch to it, so having to press the power button to "push" it isn't a big deal. The wiring (for me) was a little tricky. Little did I know that a USB A to USB B cable would connect a keyboard and mouse to computers. Once I figured it out, it worked great.
CKL Quad Monitor HDMI KVM Switch 4 Port 4K@30Hz with Cables - Extended and Mirrored Display Support for Windows, Linux, and Mac
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CKL 4 Port KVM Switch Dual Monitor DisplayPort 4K 60Hz: Unprecedented Multi-Computer Control with Audio, USB 2.0 HUBS, and DP 1.2
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TESmart 1080P 60Hz USB VGA KVM Extender Over Cat5e Cat6 Ethernet Cable - Long Range 984ft/300m (Sender+Receiver)
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4 Port USB 3.0 Switch Selector - Pubioh KVM Switch for Mouse, Keyboard, Printer, Scanner - 2 in 4 Out Sharing Box with Switch Button and 2 USB 3.0 A to A Cables
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Computer case be quiet! Pure Base 500 black
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Fractal Design Node 304 - Black - Mini Cube Compact Computer Case - Small Form Factor - Mini ITX – mITX - Enhanced Airflow - Modular Interior - Includes 3x Fractal Design Silent R2 120mm Fans - USB 3.0
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Computer case Deepcool Matrexx 55 black
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Computer case AeroCool Cylon black
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