I have both Fishman and PUTW (Powerplug) preamps (about the same price). The Fishman has volume, bass and treble controls and the PUTW just a volume control. Despite this I tend to use the PUTW more often both with PUTW and piezo pickups as it sounds more transparent to me. The gain is similar for both. The PUTW goes in the endpin jack (if there is one) while the Fishman clips onto your belt.