I had a U110 which is very similar to the U220
. It sounded pretty good, but was limited in what you could really do with it. As I remember it, it was good for all the bread and butter type typical 'band' sounds. But I wouldn't think it would be that useful for electronic music.
I still have a D110
, but i've not used it in many years. It can sound genuinely good. Perhaps even great. But it's such a major pain in the rear to program, that it left me feeling cold and uninspired. I didn't have the patience to persist with it. That said, I never did try it with the matching hardware programmer (Roland PG10). And I expect some software programmers must exist that would make it rather easier to program too. But without a more intuitive way to program it, I think it is about the most dull bit of kit I have ever owned.