Of all the effects I've tried out, I would say the worst effects I ever tried out would be the distortion channels on the rocktron utopia b100. the distortion channels were rough and metallic sounding. even though I do like the modulation effects on the rocktron utopia b100, the distortion channels is just not to my liking. I did try using a separate distortion pedal to the rocktron utopia b100, but it didn't exactly sounded that good. because of my dislike of the distortion channels, I ended up selling the rocktron utopia b100 on craig's list. personally, I choose the digitech bp355 over the rocktron utopia b100 anyday. from my perspective, the digitech bp355 has better sounding distortion channels, amp and cab models. and the modulation effects are pretty good too. not to mention that the digitech bp355 has a large variety of effects, amp and cab models unlike the rocktron utopia b100(which has a limited selection of effects). also it works well on guitar as well as bass(considering that the bp355 has a lot of guitar effects, amp and cab models). I would choose the digitech bp355 for bass and guitar.