I am a non-partison thereminista; it serves its purpose quite dramatically in appropriate situations. So did bagpipes.
About 30 seconds into "La vien rose" my wife ran in to complain about the infernal racket, comparing it to fingernails on a blackboard. Tolerantly, I switched to headphones but could only listen a bit longer to a chantoozie tune on an instrument it seems to me out of its corral.
I do prefer the sound of Hoffman's box to any decendants of it.
For all its worth.