I use ultrasonic at this time. I bought a $50 model off of "that" auction site. It is a generic made in China thing. I think you will find they are all made in China nowadays, no matter how much $$. It will handle about 30 cases or so. The more expensive models may have more power, or a larger tank. Be careful if you go this route. Check the wattage of the unit you are interested in. If you "stuff" any ultrasonic cleaner, it will take a lot longer to clean. Found a recipe on line that uses vinegar, dish soap, Birchwood Casey brass cleaner liquid. It works well, but takes about 2 hours to do a batch. If you have other things that you want to clean, such as jewelry, eye glasses, metal whatever, then you have a machine that can take care of those things. If you are just wanting to clean brass, then I would go with the stainless steel tumbling option with a bit of a "shining" liquid. From what I have read, people are very pleased with the results. As for machinery, check out online reviews and such.