I'm using this in the pit on a UK theatre tour, alongside a Pod HD500X. I have the expression pedal on the Pod programmed as a volume pedal, and the Mission pedal for wah etc.
The pedal requires no setup, it's totally plug and play (though doesn't come with a cable). The lack of calibration options is slightly annoying (though that's down to the Pod, not the pedal). However, with some tweaking of the minimum and maximum control values it works perfectly.
The unit is solidly built, and the jack socket feels totally safe. My only gripe is the pedal action itself, which is a bit "clonky" for want of a better word, particularly compared to the Pod's own pedal which is a little slower and smoother. But it just takes some getting used to.
A handy, solid piece of kit.