I had been using a Linksys 2 port KVM switch for years without a single problem so when it came time to add another computer, I naturally went with the Linksys 4 port model. Unfortunately, the 4 port model doesn't work nearly as well. The softkey controls on the 2 port model was a simple double click of any ctrl key. The 4 port model is a confusing and often times unsuccessful ctrl+alt+shift+<number>. Not only that, the keyboard and mouse appear to 'blink' out pretty regularly. Mostly the mouse, which will often freeze. This is quite annoying and I'm ready to throw this piece of product right into the trash bin. And I'm being nice!