The signal is clear and accurate. Probably too accurate. It picks up a lot of unwanted noise. The pick hitting the strings is distractingly loud. I've tried EQ'ing it away (LR baggs preamp / EQ on amp / Boss notch EQ pedal) it can be minimized, but at the expense of the sound quality of everything else, which kind of defeats the purpose.
In fairness to K&K, it seems that retrofitting a pickup to a mandolin does not seem to ever give satisfactory results (to a gigging musician).
If it wasn't for the unwanted noise, I'd be quite happy with this pickup.
That being said, I won't be using this pickup for gigs... (or anything else)