They sound, well, like piezos. Listening to an ovation or other acoustic plugged in will give you an approximation. Obviously, they sound best through an acoustic amplifier rather than the standard
electric guitar fare. At one point, I purchased a Yamaha AG Stomp for my 2027 and it sounded amazing. The AG Stomp really added some warmth and the tone seemed to be more airy and natural.
Compared to my
Parker Fly Deluxe, the 2027 piezo sounded a little inferior, but only marginally so.