I have been using a KVM switch by the same mfg but fitted with PS/2 connectors for several years already and it's a great convenience. I just bought the newest model because I'm upgrading my machines and all will have USB connections for KB and mouse, so I really had to get a new switch. The newer model has all four sets of connections permanently connected to the switch box whereas the old one you could chose to use 2, 3 or 4 sets, so I temporarily tied up two of the sets until I get around to upgrading a 3rd machine. The newer switch also has a small push button switch that toggles you from machine to machine. While it's quick to use, it also seems flimsy and I much prefer the old mechanism where you simply hit the Ctrl key twice to switch to the next PC in sequence. Now I sometimes find myself searching for the tiny KVM switch on my cluttered desk. The new switch simply slows me down when I'm switching back and forth testing programs. With the old mechanism, I was already at the keyboard. I'm also wondering if there will be a shortened life with the new switching switch again because it seems a bit flimsy to me. That aside, it works great, is simple to install and use, and the price has also taken a fall to about 1/3 of what I paid for the PS/2 based KVM switch. So my only complaint really is I'd much prefer to just need the keyboard to switch around.