This is due in part to a larger 1-8” Special Design speaker and an improved two-channel, 15W power handling. Plus it trades in a 1/8” auxiliary input for a auxiliary RCA input that can connect to a CD, tape, or drum machine. Expert reviewers praise the 15G (like its predecessor) for durability, but have noted the lack of precise effects and the lack of clean audio, though when the distortion is pumped up, it tends to sound beefy, which is good.