Pros: Best KVM I've owned. I've had a few different ones, but this is the first DVI unit I've tried. I have a home-built Vista machine, a Lenovo laptop, and an Apple Mac Mini. All 3 work perfectly with this KVM. The really sweet feature is being able to just move the KVM focus to a different machine, while keeping the multimedia (speakers & microphone) focused on another. So, while I'm listening to iTunes from my Mac, I can be working on something on the Windows machine. You can also change the focus of the USB ports, although I haven't had a need for that yet. I know this unit is expensive, but for me, it was worth every penny!

Cons: Nothing yet

Pros: I've been looking for a decent USB-DVI-KVM switch for a few years and I think this is it. Works with Linux, Windows XP, docking station Linux/XP. Works with my Wacom tablet, USB keyboard, mouse. Shortcut key is easy to use (SCROLL LOCK, SCROLL LOCK, [1-4], ENTER). No nasty ghosting like with some of the cheaper ANALOG KVM switches. Comes with all the cables you need! I've seen a lot of KVM's that make you buy them separately, so that's a plus.

Cons: My laptop running Linux failed to see the mouse plugged into the Mouse port of the KVM, but it will see it plugged into the regular USB port. I really think this is more of a Redhat Linux issue than anything. So I'm not knocking any points off for that. It can take windows a minute or so to find all the USB devices and install the drivers for the first time. Just be patient. I tried plugging a device through my keyboard's built in USB and it didn't work so well, but that's nit-picking. You can plug a hub into the back of the KVM and it works fine.

Overall Review: Why would you want to use analog monitors? PS/2 keyboards? Get this switch and get with the times. I have not tried a 30" monitor with this (I wish... no way I could convince my managers to shell out money for that). I have not tried an advanced keyboard that has extra functions, may not work.

Pros: This *COULD* be an amazing high-resolution KVM if only IOGEAR could manage to correct/update the unit's firmware. It's reasonably priced and does a *great* job under XP & Vista @ 2560x1600 resolutions, but read on about the syncing issues with RADEON video cards...

Cons: This unit has *MAJOR* firmware issues when used with any of the RADEON video cards and connected to 30" (Dell 3007) monitors (and possibly other large-sized monitors as well). It simply *WILL NOT* sync the video signal properly while the computer is booting up or is in any of the BIOS setup screens. I've tested it with several different HD2600 and HD4670 series video cards with the same results -- the monitor displays strangely-colorized-flashing-double-images of everything while booting! This occurs even when a single system is connected to the KVM and is selected! (Of course bypassing the GSC1204 KVM and connecting the monitor directly to the video cards syncs & displays everything perfectly.) In it's favor, once XP is fully loaded and switches into high-res graphics mode (even 2560x1600!) everything displays as it should. But if you ever have to make any BIOS changes you'll have to bypass the GCS1024 to do so! Also, while untested, I'd suspect that Linux users are also OOL...

Overall Review: As disturbing as the lack of a simple firmware update to correct the display syncing issue is, it's really nothing compared to the *TOTALLY WORTHLESS* customer support you get from IOGEAR!!! While they 'claim' to provide support via phone, online-chat, and email, in reality you're on endless hold if you phone; online-chat support is provided by Mrs. Wilson's 5th grade class; and email responses specifically state that you can't reply back to the same tech that attempts to assist you! For example, I knew I was going to have a problem obtaining technical support for this KVM from their online-chat support person "Iogear6" when, after describing in a great amount of detail about the monitor sync issues specified above, his first response was: Iogear6: your ATI Radeon has a DVI output? It would be funny if it wasn't so sad... BOTTOM LINE: Avoid the GCS1204 until they update the firmware to correct the major syncing issues...

Pros: Is well-built - it is compact, has a solid feel to it, and comes with things you need...like the cables. Separate control of audio from KVM and USB is fun - lets me do silly things like run a Squeezebox as audio -in while I'm typing this review.

Cons: Despite the "display emulation technology" it seemed to have trouble retaining the settings from my different systems, so I finally gave up and ran VGA from my laptop (and switched inputs at the monitor instead, which takes DVI-D, DVI-I and VGA) - sort of defeats the purpose for this particular machine. Also, the USB port for keyboard appears not to be USB 2.0? The keyboard port does not recognize my Logitech diNovo Edge's USB bluetooth transceiver, so I run it through a 4-port USB hub connected to the KVM's USB 2.0 connection (convoluted, I know, but it mostly works except that I still have my cheap-a** Dell keyboard attached to the keyboard port so that I can control the KVM). Finally, when I use the hotkeys to switch ports (vs. using the buttons on the front panel of the KVM) both mouse and keyboard consistently freeze. As a result I've stopped using hotkeys.

Overall Review: Reading back over all the cons, I'd say that this KVM basically does not fulfill its promise. If I hadn't tossed the packaging I'd probably just return it.

Pros: Works as expected. Has no apparent negative effect on gaming. Ability to change audio channels while keeping video from another. Has DVI connections, so no convert/reconvert of video signal. Looks good on my desk.

Cons: Rear USB Keyboard/mouse ports are USB 1.0. Cost. No capability to connect PS/2 computer to this KVM. So shallow that I cannot set my monitor on top of it.

Overall Review: I like this KVM. I needed to reduce the number of monitors, mice, and keyboards in my environment. My older Belkin KVM said it could handle the resolution of my current monitor, but that never proved to work. I had very positive experiance with IOGear at work, and decided to use them for this project. The only real 'issue' I have at this point is that the rear USB ports are USB 1.0. Really?! At this point, with USB 3.0, why in the world would manufacturers use 1.0? Can the 2.0 chips really be THAT much more expensive? I say this because my Logitech G-15 keyboard will not get the LCD and hot-key signals unless it has USB 2.0. Otherwise, it just works as a dumb keyboard. Admittedly, that is a Nit, but there always seem to be some minor spec in KVMs that are 'problematic' or unexpected. However, I still like the device although it seems a bit over-priced for something that has ANY USB 1.0 ports. I do recoment the device as long as the "Cons" above are not problems for you.

Pros: Specs good. Wish it worked as advertised

Cons: Worked for about 30 days. Then it went to a state where all 4 green LEDs are dimly lit. Unit is the completely non-functional. Tried removing power for 5+ seconds and after 20+ attempts plugging, unplugging, waiting, etc I got the unit to start functioning again once or twice. Got fed up finally and decided to RMA. Went through that multi week process. Got it back from ATEN (who really makes it) and the RMA packing slip does not list anything was done. There is a “code” and “remarks” section to describe what work was performed that are both blank. When I got it back it worked for a couple days and now it’s doing the same thing. I got it working once by fiddling with it. I can’t reliably get it to reset. I even tried the jumper inside the unit to reset the firmware. Nothing... very frustrated.

Overall Review: IOGEAR at least seems to read these reviews. Will follow up with what if anything resolves this.

Pros: The DVI signal seems of good quality but i don't game on my second screen. Fast video switching.

Cons: This is probably the worst KVM I have owned. I bought 10 of them for my work. I had a previous IOGEAR VGA KVM that worked great. I constantly get a key stuck event with this KVM. The Ctrl key seems to trigger it which is annoying that every time I type, I randomly get a bunch of the samecccccccccccccccccccccccccccc....lol that was impeccable timing. Also it seems to drop the keyboard and the only way to get it back is to unplug it and plug it back in. I contacted IOGear support and they are useless. Trying to tell me to bypass the KVM with a usb hub to see if works. I told the support guy already I have 10 of these with 6 different keyboard models and about 30 diiferent computers from home builts Dells laptops toughbooks embedded boards etc... I have already bypassed it and everything works fine without the KVM.

Overall Review: Stay away.

Pros: * Dual-link DVI is great * Everything else works as expected - USB etc.

Cons: * Minor thing - I like the older style switches on for example the GCS 1758, the new flat metal style is just a bit hard to push. * There isn't an 8 port model!

Overall Review: I've had 4 PCs or "devices" (like a Sunray thin client) connected to this KVM for about a year now. Monitor is a 24" at 1920 x 1200. I tried 3 other KVMs that said they supported high rez, 2560 x 1200 including another IOGear analog model and a single-link DVI model. None of them performed well enough on video to support 1920 x 1200 and have text look good with no ghosting or other problems. I actually have a 5th PC that I'd like to connect so I wish there was an 8 port version of this KVM. It's pricey but there are very few options for this level of performance.