I have had SU-700 for couple years and my humble opinion is that it is piece of crap. This piece of gear of one those which suffer from bad R&D, it feels like it was a proto project for RS-7000 and thus very badly supported by the manufacturer.
But if you're doing nothing else but fooling around with lots of loops you may find this box quite fun to play with.

-Tomi

(I don't mean to troll, I guess the machine just doesn't fit in the way I make music.)