I don't know what others experiences are but I found the headphone out on the GT40 to be rather disappointing. It is too bright and sounds harsh to me. I know the amp is capable of sounding great through full range speakers so I expected something similar through headphones. Granted, headphones can clear 20khz easily and the 6.5 inch speakers likely top out at 8-10khz or so but the harshness I hear is not above 10khz I think. What do others hear? Fender can you tune up the headphone out a bit to make it sound closer to the amp through the speakers please? That would make a great low-volume practice amp that much better.