I have a Tripplite 8 on one of my racks. It expands up to 255 machines on the same circuit, but most of the machines don't need kvm anyway. They say you're supposed to just chain them together. I like it but they're not that popular. Tap control twice and scroll. Totally convenient.
The best way to minimize degradation is to use really good cables. Tripplite makes really good thick cables.
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