Midway says they won't have them until January 8th, 2010. So maybe nobody does yet? A lot of folks do it in Harbor Freight ultrasonics and on up. I've always found it slow going with standard ultrasonic detergent solutions in my 2 1/2 gallon Bransonic unit. It works if I go to a pretty strong cleaning solution of the sort that would ultimately clean the cases with or without the ultrasonic waves anyway. 50% vinegar, for example, 5% citric acid plus a couple of drops of dishwashing liquid, or diluted Iosso Case Cleaning solution. But I never really undertook to figure out the truly best solution to use.
Another approach is to pre-soften carbon in Ed's Red or Gunzilla, then conventional ultrasonic TSP solutions do pretty well on the brass. A couple of follow-up ultrasonic water rinse followed by running water are in order, followed by a shake-out and dry.
The thing I'll be interested to try is Hornady's solution in my machine. They may have been able to fund enough work on that to get to a better compromise than I found.