the V-Tone analogue modeling on my GM108 is outstanding, if you know how to set it. 3 switches, and your usual 5 knobs, and i can get amazing distortions, metal and rock, and great cleans too. the EQ section is awesome too. i'm going to buy today a GDI21 to use as a distortion stompbox, and when i get it, ill let you know how good it is.
BM