I installed one of these in my MIA 2000 P today. Installation was a cinch, just had to wire the pickup hot/cold wires to the preamp input and the bridge ground to the jack ground. For those who haven't seen or read about it, it's a bit different from the usual onboard preamp. Instead of multi-band, it has a single eq control. With tone control centred, the sound has no discernible difference from the passive sound (apart from it being louder than passive). Cutting the tone from center boosts the bass and takes down the treble. Very K.I.S.S. and feels very intuitive. Great for fat fingerstyle and pick playing. Boosting the knob from center boosts the treble and thins out the bass somewhat. I'm not sure how much I'd use that mode, given I'm using brightish strings (DR SS Hi Beams). But with some bass boost on the amp, a slight treble boost yielded a crisper slap sound. I was originally intending to keep this bass passive, but I really feel this is a truly transparent preamp when tone control is centred so I think I'll keep it in. I'll post some clips over the next few days. I also have the new JBR-1 Raven Labs preamp which I'll be trying out in my passive Jazz bass soon. It uses the same single eq control concept, but has an active blend to alleviate some of the usual issues with blending two pickup signals. edit: it's not an active blend, but a buffered input. There's still two volume controls.