Taylor, I've owned several Yamaha TRB 6 Strings, which have piezo bridges. They're cool, and seem to give you a bit more tone than a typical active electronics package. Of course, the TRBs that I had were neck thru, with a 5 piece maple/mahogany neck and a flame maple top. I don't recall if the body core was maple or some other wood because it's been probably 10 years since I've owned them, but they're the older, neck thru models that you can find on ebay for a pretty reasonable price. They are a great bass, but nothing really compares to Alembics- especially the Series basses.
Peace;)
Frank