You may want to consider the Pure XLR preamp for perfect impedance matching and feedback control in live situations. Another good unit is the LR Baggs PADI (Para Acoustic DI). The PADI has more feedback control and tone shaping but not a perfect impedance match, however, still a good match to the K&K Mini.
Any drawbacks because of the not exact impedance matching?
I'm still kicking around the Ultra Pure Mini vs the Pure Mini, with an external preamp (if needed) for my L-03. Decisions, decisions...