Further comment re the KK..
IMO, the one slight downside of the passive KK mini is that it does not have any volume/tone control. The massive upside of that is that since it is passive, there are no battery issues and basically nothing to go wrong. Even though passive, it is plenty loud, louder through a standard guitar plug than my 414ce's ES system. But I will admit that for my personal use, having volume and tone controls at the guitar are handy. Obviously if your gigging setup allows easy reach on-stage of those controls on your sound system (or guitar) already, or you don't require any "running' changes," then that ability would be unnecessary. KK makes a separate onboard powered preamp that provides this but although the volume is adjustable while playing, the tone controls are not. They are designed to be set at whatever you want for that guitar and then left that way.
Yesterday my wife came back from a meeting in the US with a kk pure preamp that can fitted on your belt. It's about 3" square by 1.5" thick and it has volume, bass, mid, treble knobs. I fooled with it a bit and am very impressed with what it can do sound wise. Yes, it adds another "thing" in the chain which I personally don't care for as far as setting up for a gig but it's really not much of an issue and if you want/need that capability, it does a nice job and doesn't require any guitar work at all. PLUS, you can have several guitars with KKs (or other pickups) and be able to adjust any of them on the fly with the same little box. Since I have exactly that, I think it's a nice little addition. My Taylor GS 12 sounds fantastic with it - the preamp allows me to dial in a touch of bass that the 12 needs and it allows me to dial in some "sparkle" on my HD28 should I wish to use it.
I think it's a pretty neat little unit which requires NO guitar work at all to use but like everything, we all have our own "what works best for me" technique/ devices/preferences.