Ever eager to have musical experiences I've never had before, I found Dolores Catherino's use of greatly expanded chromaticism by using up to at least 106 notes per octave. The feeling of being constantly off balance but sustained is interesting. At least it is to me.
Of the people making music with these kinds of instruments, so far she's the one I've heard making actual music with them. Mostly they're just geeks getting geeky, she's a real musician.