The MixSwitch remote interface (and the little box JP built to attach to it) was quite handy, especially because it indicated to me that I'd left the CD input (which goes directly to the mains) on with the gain all the way down. I turned it off to make extra sure we wouldn't be hearing any playback mid-set.
My only worry the entire day was that it was a little too easy for someone to accidentally switch between or mute consoles mid-set... yes, you have to hold the button down for a second or so to switch, but one little button holds the power to shut the PA right off, as far as the headliner is concerned. With that button on both the front panel of the MixSwitch and on the little remote (which could be anywhere its cord can reach, god forbid the headliner's BE forget what it does and set a coffee mug down on it) I had it nagging at the back of my mind the whole show. It would be very nice if there were some way to "lock" the MixSwitch so that a switch must be pushed or a toggle flicked to allow switching between consoles... it just makes me nervous to have this one little unit arbitrating what audio gets to reach the mains.
In any case, a minor complaint, otherwise the little guy was great, provided an interested and brief conversation between the headliner's BE and myself, and saved us from having to patch one board into another, or anything of the sort. Heck, we could have struck the support board after their set if we'd wanted to, but there was plenty of time after they got off to do that and limited space at FOH.
Here's the little guy making music happen during the show: