Balances high-end "audiophile" performance with features that make tube ownership nearly maintenance-free. This is the primary reason for its popularity. It continuously monitors and adjusts tube bias in real-time, meaning you never have to manually bias tubes with a multimeter. It also allows you to use unmatched tubes and various types (EL34, KT88, KT120, KT150) without a circuit redesign. Hi-Fi+ Magazine called it "cakeism" (having your cake and eating it too) because it can serve as a simple first tube amp or a "paradise" for hobbyists who love "tube rolling" (swapping tubes to change the sound).