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.
Summary: This is the second unit I have replaced - the previous unit started having intermittent problems that would require completely disconnecting all PCs and reconnecting. But you can't beat the price, especially considering that cables are included.
Summary: This is an inventory item for my company. It's amazing how technology has gotten better and prices for tech products have plummeted. This product is good quality, gets the job done and is priced right.
Summary: I've had this KVM for about 2 years. It worked extremely well during that time, though my major regret was that it didn't have DVI or HDMI capabilities. Today it spontaneously caught fire. I was there and nothing was damaged (aside from the KVM itself, which I'm not about to use again after that), but it could have easily set my house on fire if this happened while I was away. Maybe I just got a dud, but my recommendation is obviously "avoid".
Summary: I'm a network admin for 16 years and this is so easy to get working a second grader could do it. If you need to connect multiple machines to one keyboard/mouse/video, this is for you. Price is very reasonable. I've seen similar products for over $200.