I think thereminist Carolina Eyck put it very well recently in one of her theremin videos when she said that the Moog THEREMINI is great for simple melodies and to take to parties because it is fun and has a built-in speaker.
Speaking as president of the Old Dead Composers Theremin Association, I neither like it nor dislike it. All I can say is that it is of no use for the kind of music I play (dead guy stuff) because of its latency problem. This is something that is inherent in the hardware, and that no amount of firmware updating is going to be able to fix (something Thierry Frenkel pointed out when the theremini was first introduced).
This is probably why Carolina said the instrument is great for “simple” melodies. If you attempt faster, more difficult precision passages with larger intervals the instrument’s digital sampling rate can’t keep up with the speed of your gestures. It’s the same feeling you get when you want to pass someone on the highway, and you’ve got the pedal to the floor, but your car is just barely chuggin’ along!
The instrument is probably fine for FX, experimental, “avant garde”, and other genres that do not require the kind of precision control that the works of old dead composers demand! 😀
“The most important thing for a beginner thereminist is to know exactly where you want to end up, before you start out.” Clara Rockmore