The Etherwave Plus is a great theremin. I got it as a Christmas present for my wife. I've ended up using it more than she has. It is our first theremin, and it is exactly what I had expected. It is great fun to play and my pitch sensitivity has improved (and I'm a Trombone player!) as I practice.
It is really fun to run it through some guiltier pedals and totally destroy the sound.
I've not yet used the CV out, since I don't have any CV gear.