I own both a digitech bp355 and the zoom b2.1u and they both sounded pretty cool. I totally dig those multi-effects processors. I also like korg "toneworks" processors. I guess the noticeable differences between the digitech bp355 and the zoom b2.1u is what amp models, cab models, and distortion channels that they provide. although the zoom b2.1u has a great selection of amp models, cab models, and distortion pedal models, the digitech bp355 has a larger variety of amp models, cab models and distortion pedal models. so far from my experience with the digitech bp355, this multi-effects has a more smoother sound than the zoom b2.1u. but other than that, I dig them both and they're definitely keepers. I do have sound samples of the zoom b2.1u on my soundclick website and I will be recording sound samples of the digitech bp355 and I will posting them on my soundclick website real soon.