Purchasing a KVM isn’t an easy task. The brand names aren’t necessarily well known, the prices vary wildly for the same features, information isn’t forthcoming from many of these overseas manufacturers, and product reviews are often very negative biased. I guess they just aren’t a mainstream product yet.
The review bias is an interesting phenomenon. You’re average junky CPU cooler will often have a zillion positive reviews for no good reason what so ever. People are just more liable to be happy with certain products than others regardless of the actual quality.
I purchased the IOGEAR GCS1762 KVM a month ago and I really dig it. The price was a little steep but at least it came with cables I didn’t need. I purchased much longer cables to run to my Cube which sits about 3-4m away from the LCD and keyboard. This doesn’t seem like a very large distance but companies are cheap with cable lengths these days even though you can get extra long chinese cables for very cheap.
This assumes you know which polarity of cables you need to buy for your KVM. And it’s not always easy to determine this unless you have good product photos. You also need to get a KVM with replacable cables. It’s a crime when cables can’t be detached.
My old VGA KVM, also an Iogear, worked just fine but VGA over a 4m cable is incredibly blurry and hard to deal with after a while. But it was at least USB. And it didn’t have any emulation. And that’s a good thing. I don’t know what problem emulation is supposed to solve. But emulating a missing monitor, keyboard, or mouse really just seems to cause problems for most people.
If you don’t emulate a keyboard or mouse than at worst you might get a ‘Press F1 to continue’ keyboard error on boot which you can maybe disable in BIOS anyway. The most typical issue you run in to without emulation is a slight 1-2 second lag time when you switch PCs before the USB devices re-register. Having dealt with this delay for many years I can assure you it’s never been an issue. Even when I was in the middle of a game.
Monitor emulation doesn’t seem to have a purpose. Without it, my computers simply boot up in their ‘last known good’ state. And everything just works. When a KVM has monitor emulation, if you boot the PC and that PC isn’t selected on the KVM, the KVM tells the PC that you have some bog standard VGA monitor. Windows responds by setting the resolution to something that is wrong. And Vista/Nvidia seems to INSIST on putting the Start menu on my second monitor, the one not attached to the KVM, because I assume it wants to put that on the monitor with the largest resolution or something.
I have to go in to the Nvidia control panel and fight with it for about 3 minutes before I can get everything to show properly on the primary display again. Why the Start menu EVER moves off the primary display is beyond me.
When a KVM emulates a keyboard, sometimes the extended features of those keyboards don’t work. The media keys, the scroll wheels, the volume controls, the lights and LCDs, etc. You might not notice unless you have a Logitech G15 but well I do.
The GCS1762 doesn’t seem to have much in the way of keyboard/mouse emulation but it can be gotten around by using the standard USB ports on it instead of the ones labeled keyboard and mouse. It does have the annoying VGA emulation though and that really bites. If I don’t remember to have the right PC selected when I boot it, the video gets totally screwed. But it’s my only complaint. It switches fast, my images are crystal clear, and I can even switch via keyboard commands which my old one couldn’t do.
It also has a serial port on it for updating firmware. I can’t imagine what you’d need to do that for but perhaps you can find a firmware that disables emulation. That’d be worth a look.
Anyway, if you’re in the market for a KVM, Iogear isn’t a bad choice. I can’t speak for most other models except for Belken which also seem to work just fine. Just don’t spend too much, get one with removable cables, and the smallest amount of emulation possible. Read the reviews as there are always people complaining about the problems with emulation on the ones which do it poorly.