DVI KVM switches, any progress?

[MaxBurn]

I need a plain DVI two workstation switch. Because of the nightmares I have had with USB mice and keyboards with KVM's I want to stay PS/2 because it just works (even in DOS, go figure).

I see a slew of options on the egg, very different than a year ago when I looked last. I even see an ATEN there.

Have they solved the problem of no video on a PC that is powered and the KVM wasn't switched to it?

Recommendations please both good and bad!