If, as happens, somebody gets quieter or louder, I can tweak it so quickly. No drums and no guitar! The others need the sound guy to sort their monitors, one at a time, and with the P16, I can dial up what I want so quickly. A little of the other voices is all I want. For me - I want my voice, my bass and the keys.
In ears for me and the drummer are real life savers - mainly so we can shut out the things that put us off. We all play and we all sing, and because of the harmonies we all want very different things in our mixes. It's not that complicated a device - and in my band (A Beach Boy Tribute band) our main monitoring issues is the fact that we have to be able to cope with festival and theatre stages that allow decent separation between us, and other venues who have ridiculously small performance areas forcing us to be far too close to each other.
I've had this over a year now, so can repot on how it has faired being trucked about the country, and been pretty poorly treated.