I have a Rebel 20 and am very happy with it. I was thinking of trading up for the additional features. Two channels (a biggy!) built in verb, etc. Has anyone compared them directly? If so, is the tone of the 30 better, same, or less good, than the 20? Just wondering if adding things to the circuit helped or hurt. Or if separating the clean and OD channels maybe actually improved one or both. Thoughts?