never tried that one (707)- but this thing sucked all my tone dry! I tried for some time to make it sound ok, but the only thing that helped was taking out of my system completely.
The 707 was my first (and last) foray into multi-effects, it was what I bought many years after the Roland CE-1, what a step down. I combined some effects on the 707, and it sounded great on guitar (Andy Summers type shimmering sound), but it caused the bass to peak and distort so as to be unusable.