I don't know how much of this is of use to the OP, but here's an ultrasonic newbie's experience with one:
1. I originally bought the Harbor Freight model (with 20% off coupon) for around $75.
2. They were out of solution, so when I starting doing online research for cleaning solutions, I ran across the
RCBS /
Gunslick ultrasonic cleaners, and decided to pay the extra money for the extra features (particularly the built in drain valve).
3. I got the
Gunslick version from Grab A Gun for around $126 delivered, although it might have been smarter to go RCBS due to their reputation for handling problems?
4. Got mine for cleaning silencers - after my first experiment, future plans are to initially clean the silencers in the ultrasonic (will require one cleaning solution change) and if required, finish the Element 2 baffles off in a SS tumbler. I think my SS Sparrow will be good to go after ultrasonic only. The Element 2 might also be good to go (you don't need them but so clean), although for my first cleaning I returned them to OEM state so I could try the silicone pre-treatment.
5. I plan to use the ultrasonic first, as it's much easier to change the solution (especially with the drain valve) than doing so with SS tumblers.
6. I used Hornady's Gun Cleaning Solution - I may play with other solutions down the line, but for ease / price, it ain't bad.
I would think cleaning silencers would be tougher than cleaning a gun?
I'm pretty satisfied with the results I got with my first cleaning, both with the unit and the Hornady Ultrasonic Gun Cleaning Solution.