No personal experience, but I suspect effectiveness may depend on the finish. Alembics tend to come in two different flavors: raw brass and finished brass. While an ultrasonic bath might help clean up raw brass, the real work is in polishing to obtain a shine, something that I doubt the machine can do. It might help a little more with finished brass. I have both. Either way, I question whether removing brass parts for cleaning wouldn’t be a bit less convenient than the Flitz and a microfiber cloth method.
Bill, tgo