I played a bass equipped with those today. It was a Yamaha RBX, don't know which one exactly, early flamed maple with blue sunburst model and a single P pickup. It has been customized with a graphtech equipped schaller bridge, an EMG P and volume/balance setup. Push pull in the volume simulating a tone pot turned to 0. Well, I must say that I've been VERY impressed. I played it through my SanSamp on a Behringer B300 active cab. The EMG P is fine, with a ballsy clean and dry sound. I don't like it much, but it's a pretty good pickup. Those piezos have LOWS. Pretty uncommon sound. They do good even by themselves, and they have a very highmidrangy tone, very nice for fusion and jazzrock. It really gives the mandatory clacking highs that blend perfectly with the P for slap and tapping. Playing chords with the piezo sounds fabulous. I pushed the SanSamp to get distortion and even then, it didn't sound harsh. Actually, I think these piezos could even fit as stand alone transducers. They really have a great sound.