Well, I had my tech put the TB+ in place of the Jazz, and we found out a couple of interesting things. First, the pickup works, but it is noisy. It hums unless you roll the tone back, and the tech thinks it might be that it's running as a single coil (the hum changes as you move around, but not when your hand is off or on the strings). Kinda like one coil is shorted. It doesn't seem to lack for power though. Second, when both the TB+ and the split P are engaged, they are out of phase with each other. Weird. Hey, it was used and cheap!
So how does it sound... Pretty darn good, actually. The split P and the TB+ couldn't be more different. When you switch back and forth, it's like having two different basses (so in that respect we succeeded). A very gutsy midrange - what those cork-sniffing bass mags often refer to as "burpy" mids. It also seems to react quite differently from amp to amp - in some cases to a degree I didn't expect.
Overall, I like it, but the phase thing bugs me a little bit -- mainly because the OOP sound is pretty much useless. I haven't taken any pics yet, but it looks great - and no, I haven't done any sound clips yet, either. We'll have to see how it fits into the arsenal. For comparison, I scoped out some other passive soapbar type bass pickups with similar dimensions, and there are a few to choose from - the Bartolini T-Bird thingie, SD, EMG HZ, even Mighty Mite (although I can't find a dealer near me). Based on descriptions alone, I'd probably head for the Bart or the Duncan, but I've had no experience with either model, so if anybody has a .02 contribution here, I'm listening.
BTW - has anybody ever had to repair one of these? Mark, I know you peeled one or two awhile back - are these things completely loaded with polymer?