Watch out! First post here!
I got the Horrible freight,,--(Love that one duke), US. It just plain works, for how long, I don't know. If I could predict that, I'd win the powerball.
For stained brass, or dirty for that matter, it does well. I use the Hornady solution, it too works---for brass. Capacity is limited because it has only one transducer, and limited power on that one. 40 cases is about all I put in it, then I run it for four 480 second runs, with the heat on. Best bet is to deprime them with a universal decapper, then the primer pocket ends up free of carbon as well as the inside of the case.
For gun parts, I use shooters choice aqua clean.;http://www.midwayusa.com/product/311...-gallon-liquid
It's expensive, but mixes 1-1 to yield 2 gallons of solvent.
I HAVE just tossed the slide of my glock or SA 1911 into the cleaner. It comes out completely grease, carbon and powder fouling FREE! With the BC cleaner, it strips every bit of oil off, so you have to make sure you get oil everywhere. It would work better to remove the small parts from the slides, but as long as you get every bit of the cleaner out and dry, then re-oil, no problemo.