StarTech.com 4 Port Rack Mountable USB KVM Switch with Audio & USB Hub - KVM / audio / USB switch - 4 x KVM / audio / USB - 1 local user - desktop - SV431USBAE,Black USB | Audio | USB 2.0 Hub

Bough this unit to share keyboard, mouse, speakers and secondary monitor for three systems. Unit worked exactly as needed, only challenges were finding ways to convert more modern video connections to VGA (not StarTech's problem). I've had the unit nearly two years and after unplugging all my systems for some rearrangement and cable clean-up, the audio through the switcher is being dampened to about 5% of what it should be. StarTech support was easy to contact via chat and then by phone. Unfortunately the problem could not be determined, but the good news is the three year warranty on the unit, replacement switcher is on the way from StarTech. Their support was a surprisingly pleasant experience.

1. Item is clearly used. The previous owner apparently created labels to stick on the back of it. 2. This requires specialized cables. There are no dedicated USB output ports per PC to pass the USB mouse and keyboard signals to the PC's. These specialized combo cables pass the USB signal over the VGA connection where it splits off and has a USB Connector to connect to the PC on one end. Each cable will cost you $10 or more. The monitor switching seems to work fine. I won't know about the mouse/keyboard until I get the specialized cables.

Just using it as an USB switch. Works like I wanted and is running well. I don’t use the VGA ports.

This is an interesting little kvm. I was looking for something to replace an old apex kvm and only needed 4 ports of vga/usb. It's decently well-made and "just works". All the cabling comes out the back thankfully. It uses a wall wart for power. One thing to remember: Unlike the super expensive kvms, this one disconnects from the ports you are not viewing. It isn't a problem on my FreeBSD and Windows servers in that rack, so it should work on most any OS that's fairly recent. Like most kvm switches, the vga ports are male. Neat tip: if you are wanting to use this on several boxes close together, grab four vga monitor cables from your junk box or mothballed monitors and order some female to female 15 pin gender changers here on amazon. Then you have video cables on the cheap! The vga out port to your monitor is female. I almost forgot, this kvm switches audio as well, if you need that. I hope this kvm has a fairly long life span. If so, this is a good value for the money.

Seems to work fine. But install was delayed because I had to order cables. Manufacturer please update the description to include "Startech KVM cables required and sold separately"