this is my third time buying a kk system for my guitars. the sound signature of kk, in my opinion, is very crispy and warm (it is rare to see a combination like this). If you are a fun of Andy Mckee or any candyrat artists, you would definitely love the sound from this system. the pure pickup is one of the clearest transducer pickups i've ever used (and i've tried a dozen of them, literally). The sound is warm and rich, but it does not pick the percussion very well. The mic adds the 'crispy aspect' to the system, while picking up the percussion (if you are a percussive guitar player). feedback is somehow a drawback of the system, pointing your mic towards the side of your guitar could effectively reduced the fb.
My first K&K, impressive preamp, most natural sound pups for my 22 years old Taylor K-12. But you have to handle the feedback from internal-mic carefully. Very well service from Shorline ... thx again.