I have K&K Pure in two Martins, two Lowdens, and a Fylde Mandolin. I’m a firm believer in the KISS Principle.

I plug direct into my Roland AC-60 amp or, if I’m going through a PA and using multiple instruments and depending on how well I know the sound-guy, I use either my Orchid Acoustic Pre-amp, or my pedal board with my Orchid Muting DI and Source Audio Four-Channel Programmable EQ (plus TC Polytune and Boss Chorus).

Great passive pickup, no batteries, no on-board electronics, no ugly barn-doors, no quack, just warm, natural tone.

The usual disclaimers apply......IMHO, YMMV etc.