This product was a game changer for my workstation. I have 3 machines (two HDMI, one VGA), only one monitor (with a single VGA port), and no money or space for additional screens. Enter the Monoprice 4-Port VGA Monitor Switch! Now with the flip of a switch I can route my three machines (two through cheap HDMI-VGA converters) to a single VGA screen. I have not experienced issues with image quality as some seem to indicate. It just works! Now I have a great workaround while I save up for a nice HD display.
Since earlier reviews mentioned a ghosting problem, I ran several tests after getting this box and hooking it up. In my tests, the primary cause of ghosting was total cable length. At 16' total (10' + switch box + 6'), I saw noticeable, but not terrible, ghosting that did not depend on resolution or refresh rate. With a cable directly between source and monitor, at 10' there was a a very tiny bit of ghosting (which I probably wouldn't have noticed if I hadn't been looking for it carefully). At 6' (direct cable), I saw no ghosting at any resolution or refresh rate. Using this switch box, with 9' total cable length (3' + switch box + 6') (I didn't have a combination of cables that would add up to 10'), the ghosting was comparable to the 10' direct cable, indicating the switch box made little difference. At 6' total cable length (3' + switch box + 3'), I saw no ghosting at any resolution up to 1920x1080x32x60Hz.
Aside: The box is not heavy. if you plan to put it at the very back of a desk or table with heavy cables hanging down off it, the box will tilt back. Pull the box forward a few inches or put something on top. :-)
I'm happy with it so far.
PROS: Works, appears well built, inexpensive, doesn't require power.
I bought this in 2006 and have been using it for just over 7 years. It worked great until a couple months ago it started to produce interference on the screen in weird spots. It seemed to be worse when it was a detailed image. For the price and durability, I can't complain! It's not the best quality, but it's also a lot more robust than the cheap plastic boxes I've seen on other sites for 2 or 3 times the cost of this one. It's possible that the switch started causing interference because input A fell into the switch box, because when it was loose (before it fell in), I was still getting screen interference. I'm planning on replacing it with the powered version since I think I need the extra signal boost because my cable run is nearly 100ft. I was definitely satisfied with this switch box for my needs, but I was always curious whether a powered switch would improve the screen quality. I'll find out shortly!
PROS: It lasted over 7 years
Easy to switch between different inputs
CONS: Started causing interference on the screen at the end of its life
Input A caved into the box and is no longer usable (But this was probably caused by the VGA cable being shoved against the wall and it slowly bent the connection and caused it to fall into the switch box)