Customer Rating: 
Summary: easy to setup and rugged construction
Comment: This is the best and longest lasting KVM I have purchased. I have been using one for over 5 years and had no problem whatsoever. Those who complain that it does not work on a Mac should read up on USB technology. A lot of old mac models do not provide a 5v power on any USB port even the ones directly connected to the tower. That is the fault of Apple not Startech. I use a generic DC power supply from Radioshack. The person who claims that a 2amp 5v DC block is hard to find did not do enough research. It is readily available at Radioshack stores.
The best part I like about this KVM is that it does not limit the number of consecutive key repeat strokes unlike other KVM. Try and hold down a key on a Belkin or other brand KVM and the keypress will stop after a few dozen repeats. That is bad for gaming where you have to depress a key for a long time (especially for FPS games). This KVM also recognizes higher resolution displays 1900x1200 and up. Other KVM will max out at 1600x1200.
Customer Rating:
Summary: sv431usb
Comment: This is the best KVM usb product I have used so far. It is easy to setup and operate. Technical support from startech hwlped me find the correct cables quickly.
Customer Rating: 
Summary: Mac Users Beware
Comment: If you're planning on using this switch with a Mac keyboard: Beware. Although is says "For PCs and Macs" on the box, this switch will NOT work out-of-the-box with a keyboard that has extra USB ports (which all modern Mac keyboards have). It needs the AC adapter, which is not included.
Forget about finding a generic adapter at Radio Shack. The SV431USB requires an output of 5V DC at 2 Amps, which is next to impossible to find (except on the StarView website of course).
This switch looked impressive, but I'm going to have to give it 1 star since I wasn't even able to get the keyboard going. If you have a regular keyboard and don't plan on connecting a USB hub or laptop to it, it might be worth a try.
Customer Rating:
Summary: What was Starview thinking not adding a quick change key combo on this KVM?
Comment: The video as stated in other reviews is great. The best I have seen in KVMs. The fact that it is all USB is fantastic as well. The delay in detecting the keyboard is tolerable. The reason for the low rating for me is that there is no quick key combination that allows the user to change from one computer to another via a keyboard key stroke. What was Startech thinking making a KVM that doesn't allow the user to hit a key combination to change from one computer to another. I have never heard of that from any other KVM. That is so worthless to me. I have to add one more large object to my desktop so that I can switch between computers or I have to get up from my workstation and press the button to go from one machine to the next. That is the worst mistake I could ever imagine. Startech is lucky I work on a government site that took 3 months just to get all the red tape to order, ship, and recieve the switches I wanted or else I would send them back!!! That is the lamest thing I have ever seen. If you don't mind button pushing then go ahead and buy this switch, otherwise you'll be highly disappointed.
Customer Rating:
Summary: Doesn't work out of the box
Comment: This KVM is advertised to work without a power supply under Mac and PC (as specified on the startech.com website) but doesn't. It has a 5v recepticle but doesn't even include a cheapo wall wart. The 5v voltage is not even common enough for Radio Shack to carry them so they are expecting a lot from the end user.The specific problem is I get a warning from my Macs about too much power being drawn and then the keyboad and/or mouse gets disabled.
I have 2 differnt setups where it fails to work. One consists of a PowerMac G4 and a PowerBook G4 with a ViewSonic 20" monitor, Apple Pro keyboard, and Microsoft Optical Mouse.
The other setup consists of a PowerBook G4, Old Micron Linux box, Sony 17" LCD, Apple Pro keyboard, and a Logitech Optical mouse.
These seem like common configurations so I am wondering if it is defective or unrealistic about its power requirements. I have written startech.com about this issue. I will update this review once I get a response.
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UPDATE
Startech sent me the power adapter needed when connecting to Macs. BTW, its not included. Seems to work as advertised but I have noticed that if I don't switch to a Mac for an extended period it wont wakeup.
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