All Vocal Harmony units sound awful, they all sound very artificial. But ----- they do add if they are not overused.
Right on, John! The secret is in
how it is used, and
how often.
I haven't heard a Vocal Harmony unit yet that I like...even the Helicon units sound artificial to my ears.
I still think
studio use is where it shines..."live" not so much, although sometimes doubling and delay can add a nice alternate sound to the performer's voice.
Ian