Skepticism fortunately not confirmed :-)

Situation: 2 PCs, 1 headphone (RCA), 1 Microsoft Curve 2000 Keyboard (USB), 1 3-button USB mouse, 1 monitor 1440x900 resolution (higher resolution untested - I do not need). So I wanted to work.

After plugging all the components, everything went smoothly. Could there still to see any performance degradation. On the PC I use even a VGA-DVI adapter, the other PC was easily controlled by the regular VGA port.

The switching between the two PC proceeds rapidly (2-3 seconds). The response time of the input devices (mouse and keyboard) was impeccable. A delay I could not recognize. Audio was also normal.

Conclusion: for me everything works without hesitation, so I can recommend this KVM switch with a clear conscience.