Ulfhedinn
-Skill Collector-
If one is only rebuilding his personal regulators (4 or less) I say forget about using an ultrasonic cleaner. One of my hobbies is rebuilding regulators so, yes I have a couple of US cleaners (Branson) and yes they are helpful; but learning to mix and use an acid bath (plus a little more-but not much elbow grease) is every bit as effective as an US cleaner.
However, to the OP's question: if you are bound and determined to get a US cleaner, I can recommend Branson. I bought two used on eBay and after a couple of years of moderate use are still going strong.
I would love to get me a Branson from Ebay but always worried I'm getting a fake or modded item? Recommendations?