I also didn't like using the USonic. I got one of those $100 units on ebay, and found it to be underpowered. For brass cleaning, I had to go back to restart it every 480sec. Then, I had to switch from vinegar to water to rinse it. Any air exposure when going from vinegar to water caused purple-bluish marks. Most of all, I hated the amount of labour involved in cleaning a couple of hundred cases.
With stainless, I spent $35 for 5lb of SS shot used in sandblasting. I built my tumbler from spare parts, and the container is a $15 cooler from Walmart. That's all. When I come from work, I dump about 400 9mm cases into the cooler, add water, a squirt of dishwashing gel, and a pinch of Lemi-shine. I come back 3-4Hrs later, rinse, and set them in a wire basket to dry over an air vent. I always have at lest 2-3000 clean brass on hand, so how long it dries doesn't matter. This setup takes 15min of my time to have 400 cases cleaned.
I tried to use the USonic on gun parts, and saw almost no cleaning action. YMMV if you get a more powerful unit, or maybe mine is just a lemon, I can't really say.
The only use the US sees these days is for jewelery.