Mine arrived earlier.
Top tip for anyone expecting a Theremin, make sure you've got 6xAA charged up batteries on hand.
I've just spent the last couple of hours charging batteries.
Only just had a fairly quick go, I had to resort to the instructions to get the aerial working and I'm sure I could do a better initial set up once I'm a bit more familiar with the instrument, but so far it's a lot of fun.
Using the slider and the button it's pretty easy to get a simple tune or bassline out of it.
Using the aerial is a lot more tricky, but it's early days yet.