I purchased this new about two years ago, but I've only used it once at a live performance. There are no issues with the sound or any noticeable cosmetic problems. [About the Product] An effector that provides a variety of flanger effects. - Model Name: THUNDERSTORM FLANGER - Function: TRUE BYPASS - Number of Knobs: 4 - Controls: MANUAL, FEEDBACK, DEPTH, RATE Thank you for looking.