It finally arrived today, and I must admit that my first impressions were rather mixed. It was perhaps unfair, but I took delivery at work, which meant that the only initial go I could have on it was through an old 30W amp and not very loud - basically "is it working?". I was initially impressed with the fit and finish. The tuners are excellent - smooth, easy turning but with no play. The neck is what one expects from Sire - satin finish, lovely rolled fingerboard edges. But I have to say that I was not impressed with the knobs - they feel lightweight and cheap, and to cap it off the passive tone ring was loose and kept turning beyond its end. I wasn't sure if the knob was loose or it was a dodgy pot. The pots are all different in feel especially in the detents - the bass knob has a very severe detent that engages with an audible click, but the blend pot's detent is vague and very easy to turn past.
Anyway, I got it home and things got better. Thankfully, the tone ring/knob was just loose, pot was fine. Giving it a proper blast through my pedalboard things really opened up, tone-wise. The pickups sound great to my ears. The neck pickup, despite its diminutive size compared to the bridge holds its own when soloed, but admittedly does get a little lost when blended. The preamp is OK once you get used to it. I find that the bass pot does very little. I have found that the best way to control this bass is to leave the treble and bass centred, dime the mid control then use the mid sweep as your primary tone control, using the others for seasoning. The passive tone works in both active and passive modes, which pleased me. It doesn't have a huge range, but glad it's there. The blend pot is a bit all or nothing, but that doesn't bother me as I'd be using it like a switch anyway.
Little creature comforts include the passive mode working even with the batteries removed, making it a full on "get out of jail free" card in case of battery depletion. There is very little volume difference between passive and active - in fact with the preamp set flat, I'd say passive is louder. My wireless bugs get along fine with the bass regardless of it being in active or passive mode - I know some cheap wireless bugs don't like active basses, but mine is happy enough (Lekato WS-70 for reference).
So my main (and to be honest only) beef is the knobs. I think they're ghastly. They'll be getting changed - replacements have already been ordered. But that's my only complaint, apart from nitpicky points about the preamp.
Enough waffle, have some pics.