switches

This KVM (as well as many others on the market) uses mouse and keyboard emulation, which allows one machine to be booting while the other machine is selected.

This particular switch is hardwired to emulate a generic 2-button wheel-type mouse, which means that any other type of mouse (like an old trackball, in my case) will probably not work correctly.

Some KVMs say explicitly (in their product spec) that they support particular mice models or types. For example, Startech's Ultra Compact 2-Port KVM Switch (SV211MICRO) supports MS Intellimouse (Pro Version), MS Explorer and MS Optical Mouse.

So the upshot is:

If you have a generic 2-button wheel-type mouse, any KVM should work; otherwise, you need to look for a KVM that explicitly supports your mouse model or type. And if you have a really old mouse, you may be out of luck.

If you use this KVM you'll loose almost all extra features and functions of your keyboard e.g. thumb-button, internet-shortkeys-buttons (my Logitech products are seriously crippled), and the support even advise against using cordless products. None of this information you'll find in the manual or on the retail-box!

Having used an older Linksys KVM for several years, I chose Linksys again. Unfortunately this was not a good choice. The hot key switching does not always work. I use a Logitech Cordless keyboard and Cordless trackball and the double click does not get processed quick enough to switch about 25% of the time. Get a hard button KVM as well as hotkeys.