Summary: I love the price but I have had a few hiccups with it over the past few months. I fix computers for a living and half the time while I have 4 machines plugged in, the keyboard and/or mouse will randomly stop and start working. The other issue I have on a fairly consistent basis is that the video will show reduced colors randomly on systems that it had been previously working on. I bought 2 and my friend is having the same issues.
Summary: There are some issues when firing up one PC and then later firing up the other. Sometimes it "forgets" how to switch from one to the other, but resetting the switch by pulling the main plug and plugging it back in, usually works. I did notice that I had to use jack 1 & 3 vice 1 & 2, as this happened less often. But it does what I want & at a very reasonable price.
Summary: I am using this for three laptops: a Dell, an HP, and a Lenovo Helix. I have a VGA adapter for the Helix. It switches between the three smoothly. I haven't had a problem with any not being recognized when I press the button to switch.
Summary: I had an old 4 port KVM switch running the computer lab with PS2 connectors. We were on our last PS2 keybd and mouse plus we were using PS2 to USB adapters at the PCs (as few new PCs come with PS2 connectors anymore), so we decided to go hunting for one that would accommodate USB mice and keybds. Found this one and had some decent experience with Trendnet so I pulled the trigger on it. I thought the price a tad high (for what you get) but not bad per se.
Summary: This device just does not work. I plugged it into 2 systems, one laptop running Windows 7 and one desktop running Ubuntu. It worked ok for the Ubuntu system except the hotkeys to switch no longer worked. No real good reason why they wouldn't either - they just don't. The company seems to know this and not care. However, the real issue came from the Windows 7 computer. For those that care it is a Dell M6700, so pretty new and standard brand. Nothing exotic.
Summary: I bought this to hook up 4 computers to 1 monitor, keyboard and mouse, and it works great. I have no problem switching between any of the 4 computers, either using the buttons on the KVM or using the keyboard hot key (which you can program). Been using this daily, for 4 months now, and haven't had any problems with it not working or switching properly.