I have the K&K mini in my Model D and get good results with a Zoom A3 preamp that allows acoustic guitar modelling, EQ (graphic and Parametric) and microphone modelling. I have to trim off <100 hz almost -10 db.
I also have a McIntyre feather in a Morgan (Vancouver, BC, Canada) OM rosewood. See http://www.acousticon.com/mcintyre.htm
It sounds more like the actual guitar with modelling or EQ applied but requires more gain on the preamp.
My judgement comes from recording both in my studio and playing back on my mastering system and B&W P7 headphones.