Strengths: Very small footprint. Nice design. Proprietary KVM cables are space saving (USB and audio signals are transmitted through video cables). Logitech SetPoint driver (MX1000) works perfectly.
Summary: I have been using this KVM since July 2003 without major problems. I highly recommend it (or the 2-port version) for analog dual display setting. If you want to use extra keys, connect the keyboard to a USB port, though switching capability will be lost by doing so. There is no compatibility problem with nForce4 chipset. Firmware upgrade (no beep sound when no keyboard is connected) is available.
I am still looking for a reliable KVM for digital dual display (there exists a few models, but none of them is reliable). I hope BELKIN release a dual-head DVI KVM.