I can't support any device that makes me dumb down how I play. I found that the "arpeggios" on my Yamaha S70XS would follow my left hand, assuming that it always played the root of the chord. Way too restricting!
I've used some of the more specialized voices like vibraphone and accordion in a band setting, but somehow in a solo setting, they seem cheesier. I like being able to switch off between Fender Precision and upright bass to accompany a one hand or two hand piano, Wurlitzer, Rhodes, and/or various B3 presets, but that's about it.
I'd be curious to know what you all think of Jacob Collier's use of harmonizer technology. Pretty sophisticated arrangements, but I don't think I'd want to listen to a whole show.