Ok, thumbs up to a radical approach, by incorporating an amp modeller and a rythm machine in one package. I see this mini amp & music box usable by one man band kind of setting, like for parties, get together, small club...etc.
I do have one suggestion to futher improve on this model. It's to provide a mic in (w/effects) and also make it battery portable as well. If so, it will help so much more for the one man band situation, and also for buskers as well.
Like sub said, there is too few knobs, and you need to press the menu to access the tone, modeling department. They should seperate that as well, and have direct access to tone changes. Not to mention a good function foot switch.