For those of you wondering if 2 computers is really better than one.

[Ughmahedhurtz]

How accurate is mouse broadcasting between two machines?

Just as accurate as one machine, though it isn't as fast when panning all 5 accounts.

If you need to switch between Toon 1 (machine 1) and Toon 8 (machine 2) do you do it from the main machine or you two physically switch keyboard/mouse?
For instance, when you need to micromanage a slave for whatever reason.

That's one caveat, that I can't just hit "F2" and immediately get the toon from the second PC in my main's window. Micromanaging the other slaves is trivial with Input Director: accesses both PCs just like one big desktop, including clipboard and everything.