All KVM switches work according to the same principle, and there's clearly a trend to gravitate towards USB devices. Unfortunately, only a few switch boxes currently use USB 2.0 or an on-screen display. This means that each KVM switch we tested entails a small loss of functionality - at least in this test, there is no superlative KVM switch among the candidates. But maybe that will change in the near future. We'll be keeping our eyes peeled for new developments in this area.