I just got my GT-6B and have screwed around with it for a bit. Before I go on, I must say that this FX unit is completely awesome and makes very little noticable noise on most settings, and I'm usually a noise hater. So far, I have noticed that the preset distortions aren't too great unless you want fuzz, but I think I can work it out some when I start to screw around with it. This unit has a few worthless presets as well. However, the FX I have customized sound very awesome. Overall, I think this is a great unit so far. More on this to come this weekend.