I bought one of these ("Evoluent VerticalMouse 3 Rev 2", aka VM3R2).It doesn't work with my KVM (IOGear GCS1734, neither top of the line nor junk), not with Linux or Plan 9: horizontal tracking is fine, but vertical tracking goes only up. It works ok plugged directly into a Linux box. After some mail back and forth with Evoluent, the bottom line is they don't care. They began with a defensible position (not all mice work with all KVM switches), but, when asked to name *one* switch the VM3R2 works with, they quit answering mail. Note that their web site warns against KVM switches when using the Windows driver (as if!), but does not make a general warning. It's an interesting device, but when using some (maybe all?) KVM switches you're better off with an $8 Logitech throwaway. Too bad. Dave Eckhardt
